Effects of the Insect Growth Regulator Dimilin on the Survival Rate of Larvae, Adults, and Egg Viability of Tigriopus japonicus Mori (Copepoda ; Harpacticoida)

The effects of insect growth regulator Dimilin which interfere with the synthesis of chitin in the cuticle of insect larvae were investigated at various concentrations using the copepod larvae of Tigriopus japoniu Mori. The larvae were cultured at control, 1, 5, 10, 활, 50, and 100 pub Dimilin solutions and three replicate experiment were carried out to give correct analysis. Lethal effects of Dimilin on larvae of T japoniu occurred above 1 ppb Dimilin solution after 8 days. LC50 of larvae was 50 ppb Dimilin on the 4th day. Lethal effects of Dimilin on adults of T. japoniu occurred above 1 ppb Dimilin solution after 13 days. LC50 of adults was 50 ppb Dimilin on the 12 days. Egg viability has little relation to Dimilin solution concentrations.