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1 April 2014 Abundances of a Bean Bug and Its Natural Enemy in Seminatural and Cultivated Habitats in Agricultural Landscapes
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Abstract

To determine differences in distribution patterns between the soybean pest Riptortus pedestris F. (Hemiptera: Alydidae) and its egg parasitoid Ooencyrtus nezarae Ishii (Hymenoptera: Encyrtidae) in source and cultivated habitats, we compared their abundances in soybean fields and forest edges, which were assumed to be the overwintering sites of R. pedestris. We set synthetic attractant-baited traps for both species over 2 yr in mid-August, just before R. pedestris normally colonizes soybeans. During one of the 2 yr, we also examined the rate of parasitism using an egg trap. The numbers of both R. pedestris and O. nezarae trapped at forest edges were higher than the numbers caught in soybean fields, suggesting that forest edges are important source habitats. Compared with R. pedestris, the abundance of O. nezarae in soybean fields was considerably lower than in forest edges, presumably because of differences in their dispersal abilities and their responses to landscape structure and resource distribution. Better pest control service by O. nezarae was provided at forest edges than in soybean fields. Therefore, when using pest control by O. nezarae in soybean fields, spatial arrangement and distance from the forest edge should be considered.

© 2014 Entomological Society of America
Ken Tabuchi, Hisatomo Taki, Hideki Iwai, Nobuo Mizutani, Koukichi Nagasaka, Seiichi Moriya, and Rikiya Sasaki "Abundances of a Bean Bug and Its Natural Enemy in Seminatural and Cultivated Habitats in Agricultural Landscapes," Environmental Entomology 43(2), 312-319, (1 April 2014). https://doi.org/10.1603/EN13115
Received: 23 April 2013; Accepted: 1 January 2014; Published: 1 April 2014
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