2019 Volume 2019 Issue 2 Pages 11-20
The effect of the optimal timing for the spraying of the diamide insecticides, flubendiamide or chlorantraniliprole, for the suppression of the first- or second-generation larvae of the persimmon fruit moth, Stathmopoda masinissa Meyrick, on the suppression of the persimmon bark borer, Euzophera batangensis Caradja was investigated in a persimmon orchard. Fruit damage caused by the fi rst- or second- generation larvae of S. masinissa in trees that were sprayed with diamide insecticides was as low as that in control trees. There were fewer larvae of the overwintering generation of E. batangensis on persimmon branches or twigs of trees sprayed with diamide insecticides at the optimal time for suppression of the second-generation larvae of S. masinissa than on the control trees. The number of second-generation larvae of E. batangensis on persimmon branches or twigs of trees sprayed with diamide insecticides at the optimal time for suppression of the fi rst-generation larvae of S. masinissa was as low as those on control trees. The density of the overwintering generation of E. batangensis was high, and this generation was effectively suppressed by diamide insecticides spraying; however the density of second-generation larvae of this pest was low and was considered not to require suppression by diamide insecticide spraying. Therefore, we have recommended the optimal timing of diamide insecticides spraying for the suppression of second-generation larvae of S. masinissa to control the overwintering generation of E. batangensis.
