COMPARATIVE OVICIDAL ACTIVITY OF ACETAMIPRID, THIODICARB, AND LAMBDACYHALOTHRINAGAINST BOLLWORM ON COTTON IN A FIELD ENVIRONMENT

摘要

Field trials were conducted to evaluate the ovicidal properties of acetamiprid (Assail~(TM)70WP), in Washington andPerquimans counties, North Carolina in 2001. Newly laid (white) bollworm eggs were collected from cotton foliage withinrespective treatments at 0, 1, and 2 days after application and evaluated in the laboratory for ovicidal and eclosion mortality.Acetamiprid initially (0 day) provided mortality of bollworm eggs comparable to that obtained with two ovicide standards,thiodicarb and lambda-cyhalothrin. For eggs collected at one day after application, ovicidal control of acetamiprid haddeclined more than that observed for the two standard ovicides; only the highest rate of acetamiprid provided comparableovicide activity. There was no significant ovicidal activity with any of the insecticides for eggs deposited two nights afterapplication (2 DAT). This study confirmed ovicidal activity of acetamiprid under field conditions; however, ovicidal activityof acetamiprid was ephemeral.