2013 Volume 55 Pages 51-55
Crocidolomia pavonana (Fabricius) is a serious pest of cruciferus vegetables in South East Asia and recently it has occurred in Aichi Prefecture. The insecticide susceptibility of the pest was evaluated for 25 insecticides at the three developmental stages of egg, third instar larvae, and adult. LC50 values of 20 insecticides on the third instar larvae, which were less than 10 ppm, indicated high susceptibility of the pest to them. The LC50 values of Emamectin and Spinetoram, which were 0.00066 ppm and 0.0060 ppm respectively, were especially small. To compare the LC90 value of each insecticide with its commercially used concentration, the former was much less than the latter for almost all insecticides examined. It seems to indicate the high control effect of these insecticides. Whereas, the susceptibility of the pest in egg or adult to the insecticide was much lower than that of the third instar larvae.
To compare the insecticide susceptibility of C. pavonana in the third instar larvae stage to 20 insecticides with that of S. litura, the former was much more susceptible than the latter except in the case of Lufenuron. These results indicate that C. pavonana can be easily controlled by using insecticides effective against S. litura.
