Release of the parasitic wasp Bathyplectes anurus (Thomson) (Hymenoptera: Ichneumonidae), of the alfalfa weevil Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), in Kyushu Island [Japan]
2005
Shiraishi, A.(Japan. Ministry of Agriculture, Forestry and Fisheries, Kitakyushu, Fukuoka. Moji Plant Protection Station) | Okumura, M. | Sadoshima, T. | Shoubu, M. | Sasaki, M. | Fusayasu, S.
Bathyplectes anurus (Thomson) (Hymenoptera: Ichneumonidae), a larval parasitoid of the alfalfa weevil Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), was introduced to Japan from the U.S., for biological control of the weevil. The parasitoid had been released at Saeki city (Oita Pref.), Okagaki town (Fukuoka Pref.), and Miyazaki city (Miyazaki Pref.), every spring for three or four consecutive years. A detection survey was conducted in the spring following the last year of release. In Saeki city and Okagaki town, the incidence of parasitism by B. anurus was confirmed to be within 3 km of the release point. However, rates of parasitism did not exceed 2% in both locations. The number of recovered cocoons decreased with distance from the release point. The parasitoid was not recovered in Miyazaki city.
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