Research theme for competitive and other funds (6)：
2021 - 2024 スズメバチ女王を飼い殺す新たに発見された寄生バチ:その生態と系統
2015 - 2018 Creation of the sterile oak longicorn beetle, Moechotypa diphysis, by controlling its life cycle
2012 - 2015 Developmental characteristics of the oak longicorn beetle, Moechotypa diphysis, the invasive and spreading pest, from egg to adult
2010 - 2012 Study on the risk management of a worldwide invasive important pest, Sirex noctilio
2008 - 2010 Evaluation of the insect parasitic nematode, Sphaerularia vespae, as a biological control agent for hornets
2007 - 2007 北海道で発見されたスズメバチを不妊化する寄生線虫の生活史解明
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Papers (49)：
Natsumi Kanzaki, Shun’ichi Makino, Hajime Kosaka, Katsuhiko Sayama, Keiko Hamaguchi, Shinji Narayama. Nematode and Strepsipteran Parasitism in Bait-Trapped and Hand-Collected Hornets (Hymenoptera, Vespidae, Vespa). Insects. 2023. 14. 4. 398-398
Natsumi Kanzaki, Hajime Kosaka, Yuta Fujimori, Mitsuteru Akiba. On the phylogenetic status of Contortylenchus genitalicola Kosaka & Ogura, 1993. Nematology. 2023. 25. 5. 543-548
H. Kosaka, K. Sayama, K. Okabe, S. Makino. Stylopized hornets (Vespa, Vespidae) as preferred hosts of the parasitic mite Charletonia southcotti (Erythraeidae, Acari). Insectes Sociaux. 2021. 68. 4. 371-374
Natsumi Kanzaki, Kaku Tsuda, Mitsuteru Akiba, Taisuke Ekino, Takuo Sawahata, Hajime Kosaka. Phylogenetic status of Iotonchium Cobb, 1920 and a note on the distribution of I. ungulatum Aihara, 2001. Nematology. 2021. 1-5
Dieter Slos, Vladimir V. Yushin, Myriam Claeys, Elena S. Ivanova, Hajime Kosaka, Wim Bert. Structure, development, and evolutive patterns of spermatozoa in rhabditid nematodes (Nematoda: Rhabditida). Journal of Morphology. 2020
