Abstract
The distribution of the pea leafminer Liriomyza huidobrensis expanded in Aomori prefecture. Nine new host plants species were found in 2005, and as a result, a total of 37 species of plant across 18 families were recorded as host plants in Aomori prefecture. The effects of granular insecticides against L. huidobrensis on kidney bean leaves were examined in the laboratory. Five insecticides, clothianidin, dinotefuran, thiamethoxiam, acetamiprid and nitenpyram, were tested. None of the insecticides was highly toxic on larvae and suppressed the number of oviposition punctures. The application of nitenpyram decreased number of feeding punctures and was highly toxic to eggs. It is considered that nitenpyram is a practical insecticide when it was applied to the soil just after planting ornamentals and vegetables.
