Impact of Selected Chemical and Botanical Insecticides on Trissolcus grandis (Hymenoptera: Platygastridae), a Parasitoid of Eurygaster integriceps (Hemiptera: Scutelleridae)

摘要

The lethal effects of three synthetic (deltamethrin + thiacloprid, lambda-cyhalothrin, deltamethrin) and two botanical (Palizin (R), Sirinol (R)) insecticides were assayed in laboratory conditions against adult and immature stages of Trissolcus grand's (Thomson). an egg parasitoid of Eurygaster integriceps Puton (Hemiptera: Scutelleridae). Contact bioassays determined that the synthetic insecticides caused 100% mortality of the adult wasps, while the two botanical insecticides had no lethal effects on the adults. The highest level of emergence of T. grandis females from E. integriceps eggs treated with the synthetic insecticides was observed after treatment with lambda-cyhalothrin, and the lowest adult emergence occurred following treatment of the eggs with deltamethrin + thiacloprid. Exposure of E. integriceps eggs with Sirinol impacted parasitoid emergence, but the lowest mean percentage of emergence of adults was from eggs treated when the parasitoids were second instars or pupae. Treatment of eggs with Palizin had no impact on the emergence of adults or on the activity of the parasitoid after emergence. Of these materials assayed, Palizin appears to be an excellent candidate for use in integrated pest management programs for E. integriceps.