抄録
Sensitivity to several rice paddy pesticide formulations（4 nursery-box-applied insecticides and 7 herbicides）for the tadpoles of Japanese Tree Frog（Hyla japonica） was tested. LC50 values of 4 insecticides and 4 paddy herbicides for the tadpoles were high（> 100mg/L）, however, those of 3 herbicides（Kirifuda one kilo granule, Boss one kilo granule and Sparkstar one kilo granule）were relatively low（10-30mg/L）. In the active ingredients of the 3 herbicides, which showed high toxicity, LC50 values of indanofan, esprocarb, pretilachlor and dimethametryn were low（0.3-5mg/L）. Concentration changes of these active ingredients in paddy water was calculated by the simulation model（PADDY）, and the calculated maximum concentrations of indanofan, esprocarb, pretilachlor and dimethametryn were less than LC50 values of these active ingredients for the tadpoles. These results suggest that the tested rice paddy pesticides are less likely to influence to the Japanese Tree Frog’s tadpoles.
