ナシヒメシンクイのふ化幼虫に対する各種殺虫剤の野外条件下における残効性

抄録

Thirteen insecticides were assessed in terms of their residual activity for preventing Grapholita molesta larvae from boring into apple fruits. Apple fruits were collected from an orchard 4–36 days after spraying the insecticide and fed to neonate larvae in the laboratory. Cyfluthrin, cyhalothrin, and cypermethrin showed long-lasting residual activity, causing ≥90% mortality until 26 days after treatment. High residual activity (≥90% mortality) of other pyrethroids (bifenthrin and fenpropathrin), organophosphates (chlorpyrifos and methidathion), neonicotinoids (acetamiprid, clothianidin, and thiacloprid), diamides (flubendiamide and chlorantraniliprole), and spinosyn (spinetoram) lasted ≤8 days after treatment. These results on the specific residual activity of insecticides provide information that should be taken into account to develop effective management strategies for G. molesta in apple orchards.