Faculty Profiles - TAKASU KEIJI

Information

写真a

TAKASU KEIJI

Organization

Faculty of Agriculture Department of Bioresource Sciences Professor
Faculty of Agriculture Institute of Biological Control（Concurrent）
Graduate School of Bioresource and Bioenvironmental Sciences Department of Bioresource Sciences（Concurrent）
School of Agriculture Department of Bioresource and Bioenvironment（Concurrent）

Profile

In collaboration with University of Georgia, University of Florida, ICIPE (Kenya), Kasetsart University (Thailand), and Hanoi Agricultural University (Vietnam), the following research has been conducted.1) Life history and reproductive mechanisms of parasitic wasps, 2)Host and food foraging mechanisms of parasitic wasps, and 3) learning mechanisms and their application for biodetectors, 4)Biological control of insect pests uisng parasitic wasps, 5) Biological control of weed using phytophagous insects. Since 2016, JST-JICA SATREPS project " Development and Dissemination of Sustainable Production System Based on Invasive Pest Management of Cassava in Vietnam, Cambodia and Thailand" has been conducted as a project leader. Education activities: lectures and research guidance of insect behavior to graduate students. Social actnivity: International collaborative research on biological control of crop pests. International seminar and lectures at universities in foreign contries.

Homepage

http://www.brs.kyushu-u.ac.jp/~hogo/
This web introduces our studies and the insects used for the studies.

External link

Research Areas

Environmental Science/Agriculture Science / Plant protection science

Degree

Ph. D. (Agriculture)

Research History

神戸大学農学部助手１９９５−１９９８同　　助教授　　　１９９８−２００１

Education

Kyushu University 大学院農学研究科博士後期課程

1986.4 - 1989.3
Kyushu University 大学院農学研究科修士課程農学専攻

1984.4 - 1986.3
Kagoshima University 農学部農学科

1980.4 - 1984.3

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Country：Japan

Research Interests・Research Keywords

Research theme：植物保護

Keyword：植物保護

Research period： 2024
Research theme：蚕糸・昆虫利用学

Keyword：蚕糸・昆虫利用学

Research period： 2024
Research theme：生態

Keyword：生態

Research period： 2024
Research theme： Insects associated with tropical plants

Keyword： tank bromelia, aquatic insects

Research period： 2021.3 - 2025.3
Research theme： Ecology and biological control of invasive insect pests

Keyword： Agricultural pests, natural enemies

Research period： 2006.4 - 2023.3
Research theme： parasitoid learning and its application

Keyword： parasitic wasps, learning, odor detection

Research period： 2001.4 - 2005.1
Research theme： Reproductive strategies of parasitic wasps

Keyword： parasitic wasps, life history, behavior

Research period： 1985.4 - 2017.1

Awards

日本応用動物昆虫学会論文賞（２０１７）

2017.3 日本応用動物昆虫学会 Ruberson, Takasu et al (2013) From Asian curiosity to eruptive American pest: Megacopta cribraria (Hemiptera: Plataspidae) and prospects for its biological control. Appl. Entomol. Zool. 48:3-13.

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The kudzu bug or bean plataspid, Megacopta cribraria (Fabricius), is native to Asia where it appears to be widely distributed (although the taxonomy is not entirely clear), but is infrequently a pest of legumes. This bug appeared in 2009 in the southeastern United States, where it is closely associated with kudzu, Pueraria montana Lour. [Merr.] variety lobata [Willd.] Maesen & S. Almeida. However, the insect has become a consistent economic pest of soybeans, Glycine max (L.) Merr., and some other leguminous crops in areas where large numbers can build in kudzu, in addition to being a considerable nuisance in urban landscapes where kudzu occurs. The insect has remarkable capacity for movement and has spread rapidly from nine Georgia counties in 2009 to seven states in 2012. Despite being a nuisance in urban areas and a crop pest, high populations of the bug also reduce the biomass of kudzu, which is itself a seriously problematic invasive weed, complicating the status of M. cribraria in its expanded range. Extant predators and a pathogen in the US have been observed attacking kudzu bugs in the laboratory and field, but no parasitism of eggs or nymphs has been observed to date. A single record of parasitism of an adult kudzu bug by a tachinid fly is known from the US, but no other adult parasitism has been observed in the US or elsewhere. Extant enemies may eventually significantly reduce the bug’s populations, but at present native enemies appear to be insufficient for the task, and exotic enemies from the kudzu bug’s native range may offer the best possibility for effective biological control in the US. Based on the available literature, the best option for an importation biological control program appears to be the platygastrid egg parasitoid Paratelenomus saccharalis (Dodd) because of its apparent host specificity, intimate biological linkages with M. cribraria, and wide geographic distribution in the Eastern Hemisphere. Other natural enemies may eventually emerge as good candidates for importation, but at present P. saccharalis appears to be the most promising.

Papers

A simple PCR-based method for detecting Anagyrus lopezi (Hymenoptera: Encyrtidae) and Prochiloneurus pulchellus (Hymenoptera: Encyrtidae), primary and hyper parasitoids of the cassava mealybug Phenacoccus manihoti (Hemiptera: Pseudococcidae)

Takano, S; Nguyen, NH; Le, TX; Htwe, AN; Takasu, K

ENTOMOLOGICAL SCIENCE 27 ( 2 ) 2024.6 （ ISSN:1343-8786 eISSN:1479-8298 ）

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Publisher：Entomological Science

Estimating parasitism rates in the field is essential for developing and evaluating biocontrol strategies using parasitoids. In this study, we developed a simple polymerase chain reaction (PCR)-based method for detecting parasitism of the cassava mealybug Phenacoccus manihoti Matile-Ferrero (Hemiptera: Pseudococcidae) by the primary parasitoid Anagyrus lopezi De Santis (Hymenoptera: Encyrtidae) and its hyperparasitoid Prochiloneurus pulchellus Silvestri (Hymenoptera: Encyrtidae). Primers were designed to amplify partial cytochrome c oxidase subunit I genes of each species, and their sensitivity was evaluated with mealybugs that had been parasitized by A. lopezi 0, 3, and 6 days earlier, and mummified mealybugs containing A. lopezi pupae that had been parasitized by P. pulchellus 0, 3, 6, 9, and 12 days earlier. The detection rate of parasitism by A. lopezi was 100% for all ages of A. lopezi. The detection rate of parasitism by P. pulchellus ranged from 94.1% to 100%, depending on its developmental stage. For P. pulchellus, template DNA was diluted 10 times before PCR because PCR with the original concentration showed low detection rates, presumably due to the presence of PCR inhibitors. Overall, our primers can be considered sufficiently sensitive to be used for detecting each species.

DOI： 10.1111/ens.12575

Web of Science

Scopus
Induction of leaf curling in cassava plants by the cassava mealybug Phenacoccus manihoti (Hemiptera: Pseudococcidae) Reviewed International journal

@Takano Shun-ichiro, @Utsumi Yoshinori, @Nagano Atsushi, @Takahashi Satoshi, @Ezoe Akihiro, @Seki Motoaki, #Le Thi Xuyen,@Takasu Keiji

Applied Entomology & Zoology 279 - 290 2023.8

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Language：English Publishing type：Research paper (scientific journal)
Cassava mosaic disease and its management in Southeast Asia

Uke, A; Tokunaga, H; Utsumi, Y; Vu, NA; Nhan, PT; Srean, P; Hy, NH; Ham, LH; Lopez-Lavalle, LAB; Ishitani, M; Hung, N; Tuan, LN; Hong, NV; Huy, NQ; Hoat, TX; Takasu, K; Seki, M; Ugaki, M

PLANT MOLECULAR BIOLOGY 109 ( 3 ) 301 - 311 2022.6 （ ISSN:0167-4412 eISSN:1573-5028 ）

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Language：English Publisher：Plant Molecular Biology

Key message: Status of the current outbreak of cassava mosaic disease (CMD) in Southeast Asia was reviewed. Healthy cassava seed production and dissemination systems have been established in Vietnam and Cambodia, along with integrated disease and pest management systems, to combat the outbreak. Abstract: Cassava (Manihot esculenta Crantz) is one of the most important edible crops in tropical and subtropical regions. Recently, invasive insect pests and diseases have resulted in serious losses to cassava in Southeast Asia. In this review we discuss the current outbreak of cassava mosaic disease (CMD) caused by the Sri Lankan cassava mosaic virus (SLCMV) in Southeast Asia, and summarize similarities between SLCMV and other cassava mosaic begomoviruses. A SATREPS (Science and Technology Research Partnership for Sustainable Development) project “Development and dissemination of sustainable production systems based on invasive pest management of cassava in Vietnam, Cambodia and Thailand”, was launched in 2016, which has been funded by The Japan International Cooperation Agency (JICA) and The Japan Science and Technology Agency (JST), Japan. The objectives of SATREPS were to establish healthy seed production and dissemination systems for cassava in south Vietnam and Cambodia, and to develop management systems for plant diseases and insect pests of cassava. To achieve these goals, model systems of healthy seed production in Vietnam and Cambodia have been developed incorporating CMD-resistant planting materials through international networks with The International Center for Tropical Agriculture (CIAT) and The International Institute of Tropical Agriculture (IITA).

DOI： 10.1007/s11103-021-01168-2

Web of Science

Scopus

PubMed
Cassava mosaic disease and its management in Southeast Asia Reviewed International journal

Ayaka Uke,Hiroki Tokunaga,Yoshinori Utsumi, Nguyen Anh Vu,Pham Thi Nhan,Nguyen Huu Hy,Le Huy Ham,Luis Augusto Becerra Lopez‑Lavalle,Manabu Ishitani,Nguyen Hung,Le Ngoc Tuan,Nguyen Van Hong,Ngo Quang Huy,Trinh Xuan Hoat,@Keiji Takasu,Motoaki Seki,Masashi Ugaki

Plant Molecular Biology 2021.7

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Language：English Publishing type：Research paper (scientific journal)

DOI： https://doi.org/10.1007/s11103-021-01168-2
東南アジアにおけるキャッサバコナカイガラムシの生物的防除

＠高野俊一郎,　＠松尾和典,　＃Nguyen Dat Tuan, @Layheng Sam

昆虫と自然 56 ( 5 ) 2021.3

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Language：Japanese Publishing type：Research paper (scientific journal)

Repository Public URL： http://hdl.handle.net/2324/4795128
Taro Colocasia esculenta as an alternative host plant for rearing cassava mealybug (Hemiptera: Pseudococcidae) and its parasitoid Anagyrus lopezi (Hymenoptera: Encyrtidae) Reviewed International journal

＃Nguyen Tuan, D., ＃Sam, L., ＃Zhang, C., ＠Nguyen Ngoc Bao, C., ＠Takano, S. I.,　＠Takasu, K.,

Applied Entomology and Zoology 55 355 - 359 2020.8

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Language：English Publishing type：Research paper (scientific journal)

So far, Phenacoccis manihoti (Hemiptera: Pseudococcidae) has been reared mainly with cassava. To explore alternative host plant for rearing of P. manihoti and its parasitoid Anagyrus lopezi De Santis (Hymenoptera: Encyrtidae), we examined suitability of taro Colocasia esculenta (L.) (Alismatales: Araceae) for rearing them in the laboratory, which was compared with that of cassava seedling. Either 50 newly hatched mealybug nymphs or parasitized third-instar mealybugs were reared on taro or cassava seedlings to examine immature development, fecundity and longevity of adults. Nearly 90% of P. manihoti reared on taro successfully developed to adults and they produced 230 eggs on average in their lifetime, while insects reared on cassava showed 95% survival and 250 eggs of lifetime fecundity. For A. lopezi, immature survival was 86% and they laid 140 eggs on average on taro, while it was 88% and 140 eggs on cassava. The results suggested that taro can be used for rearing of P. manihoti and its parasitoid A. lopezi.

DOI： https://doi.org/10.1007/s13355-020-00690-x
Biology and rearing of the cogongrass gall midge, Orseolia javanica Kieffer & Docters van Leeuwen-Reijnvaan (Diptera: Cecidomyiidae)

Purnama Hidayat, Arini, Dwi Guntoro, Keiji Takasu, William A. Overholt

bioRxiv 2020.2

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Language：English Publishing type：Research paper (scientific journal)

Imperata cylindrica (L.) Beauv. (Poaceae) is one of the most harmful weeds in the world because of its ability to spread and form high density, monospecific stands that exclude other vegetation. The cogongrass gall midge, Orseolia javanica Kieffer & Docters van Leeuwen-Reijnvaan (Diptera: Cecidomyiidae), is a stem galling insect that is only known to develop in cogongrass and has only been found on the island of Java in Indonesia. The midge attacks very young shoots, which stimulates abnormal growth, resulting in the formation of a purplish, elongate stem gall tappered to a point at the apical end. The aim of the current research was to describe the biology of the midge and develop a rearing method. Orseolia javanica completed its life cycle in 12-38 days with average egg, larval, and pupal periodes of 4.0 +/- 0.0, 13.5 +/- 3.8, and 8.6 +/- 6.6 days (mean +/- SD), respectively. Mated female, unmated female, and male longevities were 1.7 +/- 0.47, 1.2 +/- 0.41, and 1.0 +/- 0.00 days (mean +/- SD). Galls began to appear 29 days after larval infestation, and stem death coincided with emergence of the adult midge. The midge may have potential for biological control of cogongrass if future studies confirm a restricted host range.
Food deprivation increases reproductive effort in a parasitoid wasp Reviewed

Shun ichiro Takano, Keiji Takasu

Biological Control 133 75 - 80 2019.6

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Language：English Publishing type：Research paper (scientific journal)

Life history theory predicts that animals should increase their current reproductive effort as the probability of survival to the next reproductive opportunity decreases. We studied the effects of food depletion on life history and oviposition behavior in the egg parasitoid Paratelenomus saccharalis (Hymenoptera: Platygastridae) to determine if the parasitoid alters its reproductive strategy based on life expectancy. We first examined survivorship and reproductive effort of females provided only with water (i.e. starved) and females fed honey. Fed females lived up to 40 days, whereas starved females lived only up to 4 days. Fed females produced more offspring during life and had a higher net reproductive rate, i.e. R
₀
, compared to starved females. Starved females did produce more offspring on the first day of emergence, however, and the intrinsic rate of natural increase, i.e. r
_m
, did not differ between honey-fed and starved females. We further observed oviposition behavior in response to food availability during 24 h on the first day of emergence to determine the mechanism by which starved females increased reproductive output. Results showed that starved females oviposited more frequently than honey-fed females, and that the time required for a single oviposition was shorter for starved females. These results revealed that starved females had higher oviposition rates on the first day of emergence, leading to the similar r
_m
of starved and fed females. This indicates that P. saccharalis altered their oviposition behavior to maximize their fitness under food-depleted conditions.

DOI： 10.1016/j.biocontrol.2019.03.010
Pupal-adult parasitism of the coconut hispine beetle by the koinobiont pupal parasitoid Tetrastichus brontispae Reviewed

Keiji Takasu, Jemimah N. Ndabarua, Hieu Thi Pham, Shun ichiro Takano

Biological Control 126 90 - 96 2018.11

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Language：English Publishing type：Research paper (scientific journal)

Pupal parasitoids are considered to be idiobionts. However, some pupal parasitoids do not seem to kill or paralyze hosts at oviposition, including Tetrastichus brontispae, an endo-pupal parasitoid of Brontispa longissima. We conducted laboratory experiments to determine if T. brontispae parasitizes pupal hosts with a koinobiont developmental strategy. For this to be the case, its immatures would have to develop during the host transition from pupa to adult and in adulthood. With 0-d-old to 5-d-old pupal hosts, the T. brontispae females stung hosts of all ages with over 80% frequency. When the pupal hosts were parasitized, there were two modes of parasitism: pupal parasitism and pupal-adult parasitism. For pupal hosts that were parasitized, the majority showed a typical pupal parasitism, involving first the mummification of parasitized pupae and then the development of the parasitoid immatures within and emergence from these mummified pupae. However, the parasitized pupae that did not become mummified developed to host adults in which the parasitoid immatures developed, indicating pupal-adult parasitism. When parasitized pupal hosts were mummified, the 0-d-old to 3-d-old pupae were more likely than the older pupae to be mummified and had a greater number of parasitoid adults produced per host. The pupal-adult parasitism was not as successful. The parasitoid adults only successfully emerged from two host adults, which were parasitized as 2-d-old pupae, and one host adult parasitized as a 3-d-old pupa. The parasitoid eggs laid in 4-d-old and 5-d-old pupae continued to develop during and after the host transition from the pupa to adult. However, when the host adults died within 10 days after emergence, all the parasitoids died without completing their development. These results suggest that T. brontispae is a koinobiont parasitoid that successfully parasitizes young pupal hosts mainly through host mummification and rarely through pupal-adult parasitism. The fact that many parasitized 4-d-old or 5-d-old pupae died at the pupal or adult stage without producing any parasitoids, may also suggest that, under natural conditions, the pupal and adult mortality of B. longissima resulting from parasitism by T. brontispae is significant.

DOI： 10.1016/j.biocontrol.2018.07.013
Correction Sustainable management of Invasive Cassava Pests in Vietnam, Cambodia, and Thailand [Crop Production under Stressful Conditions (2018)] DOI: 10.1007/978-981-10-7308-3_8

Hiroki Tokunaga, Tamon Baba, Manabu Ishitani, Kasumi Ito, Ok Kyung Kim, Le Huy Ham, Hoang Khac Le, Kensaku Maejima, Keiko T. Natsuaki, Nguyen Van Dong, Hy Huu Nguyen, Nien Chau Nguyen, Nguyen Anh Vu, Hisako Nomura, Motoaki Seki, Pao Srean, Hirotaka Tanaka, Bunna Touch, Hoat Xuan Trinh, Masashi Ugaki, Ayaka Uke, Yoshinori Utsumi, Prapit Wongtiem, Keiji Takasu

Crop Production under Stressful Conditions Application of Cutting-edge Science and Technology in Developing Countries E1 2018.8

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The author Dr. Shigeto Namba has withdrawn his authorship from the chapter. Also, the authors H. Nomura, H. Tanaka, and K. Takasu have updated their affiliation as below:.

DOI： 10.1007/978-981-10-7308-3_8
Sustainable management of invasive cassava pests in Vietnam, Cambodia, and Thailand

Hiroki Tokunaga, Tamon Baba, Manabu Ishitani, Kasumi Ito, Ok Kyung Kim, Le Huy Ham, Hoang Khac Le, Kensaku Maejima, Keiko T. Natsuaki, Nguyen Van Dong, Hy Huu Nguyen, Nien Chau Nguyen, Nguyen Anh Vu, Hisako Nomura, Motoaki Seki, Pao Srean, Hirotaka Tanaka, Bunna Touch, Hoat Xuan Trinh, Masashi Ugaki, Ayaka Uke, Yoshinori Utsumi, Prapit Wongtiem, Keiji Takasu

Crop Production under Stressful Conditions Application of Cutting-edge Science and Technology in Developing Countries 131 - 157 2018.8

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Language：English

JST-JICA　地球規模課題対応国際科学技術協力プログラム（SATREPS）　ベトナム、カンボジア、タイにおけるキャッサバの侵入病害虫対策に基づく持続的生産システムの開発と普及（2015-2020年度、総額5億円）の研究者代表として、ベトナム、カンボジア、タイ、日本の4か国　計11研究機関による国際共同研究を実施している。

DOI： 10.1007/978-981-10-7308-3_8
Differences in invasiveness between two cryptic species of the coconut beetle Brontispa longissima in Timor-Leste Reviewed

Shunichiro Takano, Keiji Takasu, Matias Tavares, Marcal Gusmao, Acacio Cardoso Amaral

Biological Invasions 19 ( 6 ) 1839 - 1851 2017.6

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Brontispa longissima (Coleoptera: Chrysomelidae) is a serious pest of coconut palm, and the species contains two cryptic species: the “Asian clade” is distributed over a wide area, including Asia and the Pacific region, whereas the “Pacific clade” is distributed in a limited area. Recent invasions and outbreaks have only been reported for the Asian clade, suggesting that invasive ability may differ between the clades. To reveal differences in invasiveness, we investigated the damage potential on coconut palm and range expansion of the two clades in Timor-Leste, where both clades are present. Distribution of the clades and of severely damaged trees indicated that range expansion and outbreaks have occurred for the Asian clade but not for the Pacific clade. The Asian clade attacked trees taller than 10 m, whereas the Pacific clade seldom attacked these trees. The preference for the taller trees, which are more abundant, can facilitate range expansion and outbreaks of the Asian clade. The beetle has spread through areas where coconut palms are continuously available, but have not expanded their distribution where coconut palms are separated by large gaps. This indicates that areas free of coconut palm could serve as buffer zones to prevent spread of this beetle.

DOI： 10.1007/s10530-017-1394-4
Unique clade of alphaproteobacterial endosymbionts induces complete cytoplasmic incompatibility in the coconut beetle Reviewed

Shunichiro Takano, Midori Tuda, Keiji Takasu, Naruto Furuya, Yuya Imamura, Sangwan Kim, Kosuke Tashiro, Kazuhiro Iiyama, Matias Tavares, Acacio Cardoso Amaral

Proceedings of the National Academy of Sciences of the United States of America 114 ( 23 ) 6110 - 6115 2017.6

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Maternally inherited bacterial endosymbionts in arthropods manipulate host reproduction to increase the fitness of infected females. Cytoplasmic incompatibility (CI) is one such manipulation, in which uninfected females produce few or no offspring when they mate with infected males. To date, two bacterial endosymbionts, Wolbachia and Cardinium, have been reported as CI inducers. Only Wolbachia induces complete CI, which causes 100% offspring mortality in incompatible crosses. Here we report a third CI inducer that belongs to a unique clade of Alphaproteobacteria detected within the coconut beetle, Brontispa longissima. This beetle comprises two cryptic species, the Asian clade and the Pacific clade, which show incompatibility in hybrid crosses. Different bacterial endosymbionts, a unique clade of Alphaproteobacteria in the Pacific clade and Wolbachia in the Asian clade, induced bidirectional CI between hosts. The former induced complete CI (100% mortality), whereas the latter induced partial CI (70% mortality). Illumina MiSeq sequencing and denaturing gradient gel electrophoresis patterns showed that the predominant bacterium detected in the Pacific clade of B. longissima was this unique clade of Alphaproteobacteria alone, indicating that this endosymbiont was responsible for the complete CI. Sex distortion did not occur in any of the tested crosses. The 1,160 bp of 16S rRNA gene sequence obtained for this endosymbiont had only 89.3% identity with that of Wolbachia, indicating that it can be recognized as a distinct species. We discuss the potential use of this bacterium as a biological control agent.

DOI： 10.1073/pnas.1618094114
Seasonal occurrence and interspecific interactions of egg parasitoids of megacopta cribraria (heteroptera Plataspidae) in Japan Reviewed

Keisuke Hoshino, Taro Adati, Dawn M. Olson, Keiji Takasu

Environmental Entomology 46 ( 3 ) 487 - 493 2017.6

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We conducted a field study to determine seasonal egg parasitism rates of the kudzu bug Megacopta cribraria (F.) on the kudzu plant, Pueraria Montana (Lour.) Merr. var. lobata (Willd.) Maesen et Almeida ex Sanjappa and Pradeep, in Tokyo, Japan, during the period from May 2014 to September 2014. The eggs of M. cribraria per 1 m2 of kudzu at four locations in Tokyo were collected weekly and parasitism rates were assessed. Eggs of M. cribraria were laid on the kudzu plant from May to September. Megacopta cribraria eggs were parasitized by two parasitoid species, Paratelenomus saccharalis (Dodd) and Ooencyrtus nezarae Ishii. Paratelenomus saccharalis first appeared in May, and its parasitism rates peaked in July and September. Ooencyrtus nezarae first appeared in June and its parasitism rates peaked in July. Except for one location which could not be statistically analyzed because of the small sample size, occurrence of parasitism by P. saccharalis and O. nezarae in M. cribraria egg masses was independent at one location and positively associated at two locations, suggesting that the use of host egg masses by P. saccharalis and O. nezarae is not mutually exclusive. Parasitism rates by P. saccharalis and O. nezarae were significantly lower for egg masses parasitized by both species than for those parasitized by a single species. The proportion of males among O. nezarae progeny was significantly higher for egg masses parasitized by O. nezarae together with P. saccharalis than for those parasitized by O. nezarae alone. These results suggest that parasitism of host egg masses by the two species is influenced by their interspecific interactions.

DOI： 10.1093/ee/nvx060
Time perception-based decision making in a parasitoid wasp Reviewed

Jean Philippe Parent, Keiji Takasu, Jacques Brodeur, Guy Boivin

Behavioral Ecology 28 ( 3 ) 640 - 644 2017.5

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The capacity of animals to measure time and adjust their behaviors accordingly has been a topic of interest in vertebrates, but little evidence is currently available for insects. This capacity has yet to be properly investigated in parasitoid wasps, even though they are frequently used to test ecological models. Here, using associative learning between odors and time intervals, we show that the parasitoid wasp Microplitis croceipes (Hymenoptera: Braconidae) has the capacity to measure time. When released in a wind tunnel, females flew toward an odor associated with the time interval they had just experienced. We also found that reducing energy expenditure by restraining parasitoid wasp movement during the training interval prevented time perception. This serves as experimental evidence of time perception in a parasitoid wasp, provides both a rare example of learning associated to a time interval in an insect and a mechanism by which these animals could optimize their behaviors, as well as suggesting a role for energy expenditure in its time perception mechanism.

DOI： 10.1093/beheco/arw171
Potential Biological Control Agents for Management of Cogongrass (Cyperales Poaceae) in the Southeastern USA Reviewed

William A. Overholt, Purnama Hidayat, Bruno Le Ru, Keiji Takasu, John A. Goolsby, Alex Racelis, A. Millie Burrell, Divina Amalin, Winnifred Agum, Mohamed Njaku, Beatrice Pallangyo, Patricia E. Klein, James P. Cuda

Florida Entomologist 99 ( 4 ) 734 - 739 2016.12

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Cogongrass, Imperata cylindrica (L.) Palisot de Beauvois (Cyperales: Poaceae), is a serious invasive weed in the southeastern USA. Surveys for potential biological control agents of cogongrass were conducted in Asia and East Africa from 2013 to 2016. Several insect herbivores were found that may have restricted host ranges based on field collection data and life histories. Stemborers in the genus Acrapex (Lepidoptera: Noctuidae) were collected from cogongrass in Tanzania, Uganda, and Japan. In the Philippines, larvae of Emmalocera sp. (Lepidoptera: Pyralidae) and Chilo sp. (Lepidoptera: Crambidae) were found boring in cogongrass. Cecidomyiid midges were found in both Japan and Indonesia. A Japanese midge identified as a Contarinia sp. (Diptera: Cecidomyiidae) caused deformation of the stem, whereas the Indonesian midge Orseolia javanica Kieffer & van Leeuwen-Reijinvaan (Diptera: Cecidomyiidae) induced the formation of a basal stem gall. Previous research suggested that the host range of O. javanica was restricted to cogongrass.

DOI： 10.1653/024.099.0425
Ability of Megacopta cribraria (Hemiptera Plataspidae) to Cling to Different Surfaces against Extreme Wind Reviewed

Shunichiro Takano, Keiji Takasu

Journal of Insect Behavior 29 ( 3 ) 256 - 261 2016.5

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The kudzu bug, Megacopta cribraria (Fabricius), is native to Asia but recently invaded the US and is expanding its distribution rapidly. To assess the probability of this bug traveling by attaching to the exteriors of fast-moving vehicles, we investigated the ability of M. cribraria adults to cling to stages with different surfaces (cloth, metal, or glass) against extreme airflows in a transparent acrylic tube connected to a vacuum cleaner. On the stages with cloth and metal, insects remained on the stages at 100 km/h wind speed. Estimated wind velocities required to blow 50 % of insects from the stages within 1 min were more than 100 km/h (cloth); 60 km/h (metal); and 40 km/h (glass) for males and 100 km/h (cloth); 50 km/h (metal); and 30 km/h (glass) for females. Together with frequent observations of attached M. cribraria on vehicle exteriors in the field, our results indicate a fairly high probability of range expansion of this species by attachment to vehicles.

DOI： 10.1007/s10905-016-9557-1
キムネクロナガハムシに存在する2つの系統　東ティモールでの2系統間のココヤシへの加害と分布拡大

Shunichiro Takano, Keiji Takasu

ハムシの生態と行動 2015.10

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Language：Japanese
Acrapex azumai Sugi (Lepidoptera: Noctuidae) as a possible biological control agent of the invasive weed Imperata cylindrica (L.) Beauv. (Poaceae) in the United States Reviewed International journal

K. Takasu, Y. Yoshiyasu, A. M. Burrell, P.E. Klein, A. Racelis, J. A. Goosby, W. A. Overholt

Lepidoptera Science 65 ( 1 ) 30 - 35 2014.4

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An acquired distaste Sugar discrimination by the larval parasitoid Microplitis croceipes (Hymenoptera: Braconidae) is affected by prior sugar exposure Reviewed

J. K. Makatiani, H. K. Le, D. M. Olson, F. L. Wäckers, Keiji Takasu

Journal of Experimental Biology 217 ( 10 ) 1692 - 1700 2014.1

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We examined gustatory responses of the larval parasitoid Microplitis croceipes to determine whether the adults discriminate among common sugars, including fructose, glucose, maltose and sucrose, found in plants. When given single sugar solutions of sucrose, glucose, fructose and maltose at concentrations of 0.008-2.0 mol l^-1, the estimated concentrations at which 50% of wasps initiated feeding ranged between 0.054 and 0.085 mol l-1 for sucrose, glucose and fructose, which was significantly lower than for maltose. Wasps showed a strong decrease in feeding time for maltose or fructose following a brief exposure to other sugars, suggesting that wasps can distinguish maltose and fructose from the other sugars tested. The higher acceptance threshold and short feeding time in the case of maltose appears adaptive in light of the relatively poor nutritional quality of the sugar in the longevity trial. The pronounced feeding inhibition seen for fructose following exposure to other sugars is not linked with lower nutritional performance. This feeding inhibition was even seen in wasps that had fed on glucose at the lowest acceptance threshold (0.031 mol l^-1) and persisted for 24 h. This study is the first to show feeding inhibition of otherwise phagostimulant sugars such as maltose and fructose after gustatory stimulation on other sugars.

DOI： 10.1242/jeb.091843
Acrapex azumai Sugi (Lepidoptera, Noctuidae) as a possible biological control agent of the invasive weed Imperata cylindrica (L.) Beauv. (Poaceae) in the United States Reviewed

Keiji Takasu, Yutaka Yoshiyasu, Millie Burrell, William Overholt

Lepidopteran Science 65 ( 1 ) 30 - 35 2014

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Reproductive biology of Ooencyrtus nezarae, an egg parasitoid of the kudzu bug Megacopta cribraria in Japan

Keiji Takasu

Entomology 2014 TMP's, P-IE Section: Biological Control A 2014

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Reproductive strategies of the larval parasitoid Microplitis croceipes Reviewed International journal

J. K. Makatiani, A. Y. Bruce, F. Schulthess, Keiji Takasu

Entomologia Experimentalis et Applicata 148 ( 3 ) 223 - 233 2013.9

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DOI： 10.1111/eea.12099
Comparative developmental and reproductive biology of geographical populations from two cryptic species in Brontispa longissima (Coleoptera Chrysomelidae) Reviewed

Shunichiro Takano, Keiji Takasu, Mika Murata, Nguyen Thi Huong, Satoshi Nakamura

Entomological Science 16 ( 3 ) 335 - 340 2013.7

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Brontispa longissima is a serious pest of the coconut palm Cocos nucifera, presumed to have originated in Papua New Guinea and Indonesia. It recently invaded Southeast and East Asia, where outbreaks have been reported. Mitochondrial DNA analysis reveals two cryptic species in B.longissima: one is distributed over a wide area including Asia and the Pacific region (the Asian clade) and the other in a limited area in the Pacific region (the Pacific clade). Recent invasions and outbreaks have been reported only from the area where the Asian clade has been found, suggesting that this clade has become a pest in Asia. To infer if the Asian clade has the ability to establish, spread and outbreak in novel habitats more effectively than the Pacific clade, we compared life-history traits between the two populations of different clades. The net reproduction rate (R₀) was 130.0 and 94.0, the mean length of a generation (T) was 57.7 and 54.7 days, and the intrinsic rate of natural increase (r) was 0.084 and 0.083 per day for the population from Ishigaki Island, Japan (ISH) (the Asian clade) and for the population from Papua New Guinea (PNG) (the Pacific clade), respectively. Although the difference in r was little, the simulated population growth showed that the ISH population can be 1.6 times larger than that of the PNG after ten generations. The rapid population growth of the Asian clade would be partly responsible for its establishment, spread and frequent outbreaks in Asia.

DOI： 10.1111/ens.12007
Rapid discrimination of two cryptic species within Brontispa longissima (Gestro) (Coleoptera: Chrysomelidae) by PCR–RFLP Reviewed International journal

Shun-ichiro Takano, Atsushi Mochizuki, Keiji Takasu, Kazuhiko Konishi, J. C. Alouw, D. S. Pandin, Satoshi Nakamura

Journal of Pest Science 86 ( 2 ) 151 - 155 2013.6

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DOI： 10.1007/s10340-012-0474-6
Olfactory associative learning of mate searching cues by the larval parasitoid Microplitis croceipes

Keiji Takasu

The third International Entomophagous Insects Conference 2013.6

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From Asian curiosity to eruptive American pest: Megacopta cribraria (Hemiptera: Plataspidae) and prospects for its biological control Reviewed International journal

Ruberson, John R., Keiji Takasu, Buntin, G. David

Applied Entomology and Zoology 48 ( 1 ) 3 - 13 2013.2

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DOI： 10.1007/s13355-012-0146-2
Cold tolerance of the coconut hispine beetle Brontispa longissima (Coleoptera: Chrysomelidae) in Japan Reviewed International journal

Takano, S., Takasu, K., Ichiki, R. T., Nakamura, S

Applied Entomology and Zoology 47 ( 3 ) 2012.8

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DOI： 10.1007/s13355-012-0105-y
Parasitisation of Tetrastichus brontispae (Hymenoptera: Eulophidae), a biological control agent of the coconut hispine beetle Brontispa longissima (Coleoptera: Chrysomelidae) Reviewed International journal

H.T. Nguyen, T.T. Oo, R.T. Ichiki, S. Takano, M. Murata, K. Takasu, K. Konishi, S. Tunkumthong, N. Chomphookhiaw & S. Nakamura

Biocontrol Science and Technology 22 ( 8 ) 2012.7

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DOI： http://dx.doi.org/10.1080/09583157.2012.698250
Life history traits and damage potential of an invasive pest Brontispa longissima (Coleoptera: Chrysomelidae) on Satakentia liukiuensisens Reviewed International journal

Shun-ichiro TAKANO, Keiji TAKASU, Tsutomu FUSHIMI, Ryoko T. ICHIKI and Satoshi NAKAMURA

Entomological Science 15 2012.4

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DOI： 10.1111/j.1479-8298.2011.00506.x
Induction of host-plant preference in Brontispa longissima (Gestro) (Coleoptera: Chrysomelidae) Reviewed International journal

Takano, S., Takasu, K., Ichiki, RT., Fushimi, T., and Nakamura, S

Journal of Applied Entomology 135 2011.4

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Two cryptic species in Brontispa longissima (Colenoptera: Chrysomelidae): evidence from mitochondrial DNA analysis and crosses between the two nominal species. Reviewed International journal

Takano, S., Mochizuki, A., Konishi, K., Takasu, K., and Nakamura, S.

Annals of Entomological Society of America 104 2011.3

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Occurrence and distribution of the coconut hispine beetle Brontispa longissima in the Southwest islands of Japan International journal

Takano, S., Sugeno, S., Mochizuki, A., Nakamura, S. and Takasu, K.

Proceedings of 7th International AFAS Joint Symposium between Korea and Japan 2010.11

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Suitability of potential host plants in Japan for immature development of the coconut hispine beetle, Brontispa longissima Gestro (Coleoptera: Chrysomelidae) Reviewed International journal

Ai Yamashita and Keiji Takasu

JARQ 44 ( 2 ) 2010.4

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Effect of temperature on egg maturation and longevity of the egg parasitoid Ooencyrtus nezarae (Ishii) (Hymenoptera: Encyrtidae)

Kyawt San Dar Aung, Keiji Takasu, Takatoshi Ueno and Masami Takagi

J. Fac. Agr. Kyushu Univ. 55 ( 1 ) 2010.4

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Insecticide Odour Interference with Food-Searching Behaviour of Microplitis croceipes (Hymenoptera: Braconidae) in a Laboratory Arena Reviewed International journal

Andrei Alyokhin , Jacqueline Makatiani and Keiji Takasu

Biocontrol Science and Technology 2010.4

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An invasive pest Brontispa longissima (Gestro) (Coleoptera: Chrysomelidae) attacks an endemic palm in the Yaeyama Islands, Japan Reviewed International journal

Takasu, K., Takano, S., Konishi, K., and Nakamura, S.

Applied Entomology and Zoology 2010.1

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Use of mature leaves of coconut palm and the cattail for laboratory rearing of the coconut leaf beetle Brontispa longissima Invited Reviewed International journal

Ai Yamashita, Amporn Winotai, Keiji Takasu

Journal of Agricultural Science and Technology at CNU 2009.6

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Learning of narcotic odors by a parasitoid Invited Reviewed International journal

Huong Lan Bui, Keiji Takasu

Journal of Agricultural Science and Technology at CNU 2009.6

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Development of Myanmar strain of Cotesia vestalis (Hymenoptera: Braconidae) on its host plutella xylostella (Lepidoptera: Plutellae) at different temperatures Reviewed International journal

Ah Nge Htwe, Masami Takagi and Keiji Takasu

J. Fac. Agr. Kyushu Univ. 2009.3

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Suitability of potential host plants in Japan for immature development of the coconut hispine beetle, Brontispa longissima Gestro (Coleoptera: Chrysomelidae) Reviewed International journal

Ai Yamashita, Keiji Takasu

Bulletin of the Institute of Tropical Agriculture Kyushu University 2009.3

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Laboratory rearing of the diamondback moth Plutella xylostella (L.) (Lepidoptera: Plutellidae) with artificial diet Reviewed International journal

Ah Nge Htwe, Keiji Takasu and Masami Takagi

J. Fac. Agr. Kyushu Univ. 2009.3

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Life history of the tick parasitoid Ixodiphagus hookeri (Hymenoptera: Encyrtidae) in Kenya Reviewed International journal

Keiji Takasu and Satoshi Nakamura

Biological Control 2008.5

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Winter crop problems associated with the introduction of hybrid rice: protection of crucifer crops against DBM Invited Reviewed International journal

Keiji Takasu, Kazuo Ogata, Ah Nge Htwe, Giang Thi Thu Ho and Masami Takagi

Proceedings of the JSPS International Seminar 2007, Hybrid rice and agroecosystem 2007.11

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Invasion of the coconut hispine beetle, Brontispa longissima: Current situation and control measures in Asia. Invited International journal

Konishi K, Nakamura S, and Takasu K

Proceedings of International Symposium for Invasive Alien Species in Monsoon Asia: 2007.10

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The larval parasitoid Microplitis croceipes oviposits in conspecific adults. Reviewed International journal

Keiji Takasu and Le K. H.

Naturwissenschaften 94:200-206. 2007.3

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Comparison of detection ability of learned odors between males and females in the larval parasitoid Microplitis croceipes (Hymenoptera: Braconidae). Reviewed International journal

Keiji Takasu, Rains R. C. and Lewis, W. J.

Entomologia experimentalis et applicata 2007.3

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Importance of multidisciplinary research for insect pest management. Invited Reviewed

Keiji Takasu

Inst. Trop. Agric. Kyushu Univ. 2005.12

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Helicoverpa armigera as an alternative host of the larval parasitoid Microplitis croceipes (Hymenoptera: Braconidae) Reviewed

Keiji Takasu

Applied Entomology and Zoology 40 ( 4 ) 679 - 686 2005.11

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DOI： 10.1303/aez.2005.679
Parasitic wasps learn and report diverse chemicals with unique conditionable beehaviors Reviewed International journal

D.M. Olson, G. C. Rains, T. Meiners, K. Takasu, M. Tertuliano, J. H. Tumlinson, F. L. Wackers, and W. J. Lewis

Chemical Senses 28 ( 6 ) 545 - 549 2003.8

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DOI： 10.1093/chemse/28.6.545
Interactive-web of factors governing effective natural enemy foraging behavior. Overview of food resources as a critical component. Invited Reviewed International journal

Olson, D. M., Lewis, W. J., and Keiji Takasu

International Symposium on Biological Control of Arthropods. 1900

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