1997 年 1997 巻 44 号 p. 201-204
Effects of three insecticides, Imidacloprid, Buprofezin, and MEP on the population increase of the treated generation and the next generation of Trichogramma japonicum were investigated by the life table method. By dipping method into practical concentration, the toxicity of Imidacloprid and Buprofezin was lower than MEP; that is, the Trichogramma adult of the treated-generation could oviposit, the fecundity, net reproduction rate [Ro], innate capacity for increase [rm] of the treated generation and of the next generation had no significant difference from check. The toxicity of MEP was relatively higher on the wasp. When the prepupae were treated with MEP, the [rm] of the treated generation became negative. When the eggs treated with the said chemical, the fecundity of the treated generation adults was significantly lower than that of check. But the values of the population increase parameter in the next generation recovered to the level of the untreated population.