Antifeeding Activities of Chlordimeform and Some Plant Diterpenes When Injected into Tabacco Cutworm:Mode of Action of Antifeeding Compounds in the Larvae of the Tabacco Cutworm, Spodoptera litura (F.) (Lepidoptera: Noctuidae) (Part 2)

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The antifeeding effects of chlordimeform and some plant diterpenes injected into the larvae of the tobacco cutworm, Spodoptera litura (F.) were studied. A clear positive correlation between the used concentrations in log and the antifeeding ratios in probits were observed. In non-starved larvae, the order of decreasing effectiveness within AC50 values was: clerodin>caryoptin>clerodendrin-A≈clerodendrin-B>chlordimeform, while within AC95 it was: clerodin>caryoptin≈clerodendrin-B>clerodendrin-A≈chlordimeform. High concentrations of chlordimeform injected larvae showed behavioural changes which affected normal feeding behaviour. Wriggling of the body, lack of coordination and head rotation followed by quick locomotion were the obvious excitation symptoms. Although the natural diterpenes were very effective antifeedants, the injected larvae were less active having no excitation or abnormal behaviour. The different outward symptoms caused by chlordimeform from those caused by the natural diterpenes suggest different modes of action in this insect pest.
日本農薬学会の論文