We evaluated the effects of 23 insecticides and 9 fungicides on the mite Neoseiulus barkeri(Hughes)collected from melon and gerbera greenhouses. The insecticides nitenpyram, acetamiprid, flufenoxuron, chlorantraniliprole, pyridalyl, acequinocyl, cyenopyrafen, cyflumetofen, and pyflubumide, and the fungicide flutianil+mepanipyrim had no effect on the survival and fecundity of adult females. In contrast, the insecticides spinosad, spinetoram, abamectin, emamectin benzoate, milbemectin, and fluxametamide, and the fungicide quinoxaline were toxic. The period of residual toxicity on the survival and fecundity of adult females was about 28 days for fluxametamide and less than 4 days for spinosad, spinetoram, abamectin, emamectin benzoate, milbemectin, and quinoxaline.
The rice stink bug, Niphe elongata(Dallas)(Hemiptera: Pentatomidae), is a serious pest that sucks the contents out of developing rice kernels and causes peck rice. The bug hibernates during the adult stage, and we have identified a hibernating site where dead gramineous grasses grow in a wooded area. This study investigated the time taken for the adult bugs to leave the hibernating site and enter a paddy field. Adults inhabited the hibernation site until early July and left it in mid-July. After leaving the site, the adults entered a paddy field where the rice plants had emerged. Thus, our study revealed when the overwintering adults left the hibernating sites and moved to the paddy fields.