静岡県における斑点米カメムシ類の種構成および4種薬剤のアカスジカスミカメに対する殺虫効果

Abstract

The species composition of rice stink bugs in Shizuoka Prefecture, Central Japan, was investigated. In the eastern region of Shizuoka Prefecture, the number of rice stink bugs and the proportion of Stenotus rubrovittatus were low. In contrast, in the western region of Shizuoka Prefecture, the number of rice stink bugs and the proportion of S. rubrovittatus were high. There was a weak positive correlation between the percentage of Lolium multiflorum that emerged around the field, and the number of S. rubrovittatus captured in the rice paddy levees and the surrounding weeds. Additionally, the proportion of Lagynotomus elongatus has increased in the western region of Shizuoka Prefecture since 2018. The effects of four insecticides (MEP [fenitrothion], ethiprole, etofenprox, and dinotefuran) on adult S. rubrovittatus individuals were investigated. The results showed that all insecticides, especially MEP and etofenprox, were effective.