Method for increasing the residual efficacy of insecticides on the cigarette beetle, Lasioderma serricorne (F.) (Coleoptera: Anobiidae) using adult settling behavior

Most cigarette beetle adults (Lasioderma serricorne) readily get into pipe rows of corrugated paper, and then settle there for a long time. Therefore, an insecticide application technique that takes advantage of this behavior was evaluated in the laboratory. Four strips of corrugated paper (23 cm in length, 2 cm in width) treated with the insecticides were arranged in a square on the floor of an insect cage (35 cm x 35 cm, 50 cm in height), and then the insect adults were released. Residual efficacies of the corrugated papers treated with chlorpyrifos-methyl, pirimiphos-methyl, and fenitrothion (dosage: 125 mg Al/m(2)) on the insect adults consistently achieved almost 100% mortality. The minimum AI dosages which achieved more than 90% mortality after 4-months storage under conditions of 27 degreesC and 60% RE were in 250 mg AI/m(2) of chlorpyrifos-methyl, 500 mg AI/m(2) of pirimiphos-methyl and 1,000 mg AI/m(2) of fenitrothion. The corrugated paper treated with these three insecticides showed no repellency to the insect adults immediately after treatment. These results suggest that corrugated paper treated with these insecticides would provide an excellent residual efficacy on the cigarette beetle adults. In contrast, corrugated paper treated with permethrin showed a low mortality of, and high repellency to, the insect adults.