Hoelmer博士歓迎ミニシンポジウム
日時：2015年7月13日（月）16:30～18:00
場所：九州大学箱崎キャンパス21世紀交流プラザII第一講義室
Access map（No. 58） http://www.kyushu-u.ac.jp/access/map/hakozaki/hakozaki1.pdf
世話人：糸山 享（明治大）・三田 敏治（九大院）
Organizers: Dr. Kyo Itoyama (Meiji Univ.) & Toshiharu Mita (Kyushu Univ.)
講演１（英語）：
Dr. Kim Hoelmer & Dr. Christine Dieckhoff (USDA). Pest status and prospects for biological control of Halyomorpha halys in the USA. （アメリカ合衆国におけるクサギカメムシを対象とした生物的防除の現状と展望）
要旨：The invasive brown marmorated stinkbug, Halyomorpha halys Stal, first identified in the U.S. in the Allentown, Pennsylvania in 2001, has spread from the east to the west coast and has now been found in 42 states, with at least13 states on both coasts reporting significant agricultural damage in addition to its nuisance status as an invader of buildings during the coldest months of the year. Native North American parasitoids have very low rates of successful development in H. halys. Therefore, an Asian egg parasitoid of H. halys, Trissolcus japonicus, has been under study in U.S. quarantine facilities since 2007 to evaluate its efficacy as a candidate classical biological control agent and its host specificity with regard to the pentatomid fauna native to the United States. Information on physiological host range (ability to successfully develop in a host) is ideally accompanied by knowledge of ecological (realized) host range and parasitoid behavior, because maximum-challenge laboratory conditions often overestimate the likely impact and host range in the field. Given that hundreds of pentatomid species occur in the U.S., some of which are predatory species, extensive host range testing of Asian Trissolcus, including T. japonicus, as candidate agents for H. halys has been in progress.
講演２（英語）：
Tomohiro Honda (Meiji Univ.) Searching for egg parasitoids of Glaucias subpunctatus.
本田知大（明治大）ツヤアオカメムシ卵寄生蜂の探索．
要旨：Glaucias subpunctatus (Walker) causes serious damage on fruit. We conducted field investigation to collect their egg parasitoids. Sentinel egg masses of G. subpunctatus from laboratory colonies were exposed in the field and recollected. In addition, we surveyed G. subpunctatus egg masses from the field. Each egg mass were kept in the laboratory until emergence of parasitoids. Trissolcus japonicus (Ashmead) was emerged from exposed eggs. From field collected eggs, T. jaonicus, T. plautiae (Watanabe) and Anastatus japonicus (Ashmead) were emerged.
講演３（英語）：
Toshiharu Mita (Kyushu Univ.) & Kazunori Matsuo (Mima-shi, Tokushima) Species composition and seasonal occurrence of egg parasitoids of Plautia stali.
三田敏治（九州大）・松尾和典（美馬市）チャバネアオカメムシ卵寄生蜂の種構成と季節消長．
要旨：Egg parasitoids have been thought as effective natural enemy of bugs attacking fruit tree in Japan, but our knowledge is quite limited. To evaluate their ability, we should understand their activity in the field. At first, we show seasonal occurrence and species composition of egg parasitoids of Plautia stali based on field survey at 2012. Sentinel egg masses of P. stali were obtained from laboratory culture and set on Japanese cypress tree at Kanagawa Prefecture, central Honshu. Finally, 3 families, 4 genera and 7 species of parasitoids were recognized. Among them, Trissolcus "japonicus" was the most dominant species. Total parasitism ratio of all species was 7–80％. The parasitism ratio was decreased from the end of August. Two Trissolcus species, T. japonicus and T. plautiae are morphologically similar but distinguishable by presence or absence of sublateral seta on metasomal tergite I. Previously T. plautiae was considered as a junior synonym of T. japonicus, however, Matsuo et al. (2014) indicated their difference by the presence of reproductive isolation and genetic variation. After this finding, we reevaluated samples collected in 2012, and found that about 20% of T. "japonicus" were really T. plautiae. Both species often emerged from the same egg mass, and they are probably distributed in temperate Asia widely. Therefore, careful attention to their identity is required, especially on previous records.
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