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Comparative Ovicidal Activity of Acetamiprid, Thiodicarb, and Lambda-Cyhalothrin against Bollworm on Cotton in a Field Environment

Margery L. Ambrose, J.R. Bradley, Jr. and John W. Van Duyn


ABSTRACT

Field trials were conducted to evaluate the ovicidal properties of acetamiprid (Assail 70WP), in Washington and Perquimans counties, North Carolina in 2001. Newly laid (white) bollworm eggs were collected from cotton foliage within respective 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 had declined more than that observed for the two standard ovicides; only the highest rate of acetamiprid provided comparable ovicide activity. There was no significant ovicidal activity with any of the insecticides for eggs deposited two nights after application (2 DAT). This study confirmed ovicidal activity of acetamiprid under field conditions; however, ovicidal activity of acetamiprid was ephemeral.





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Document last modified May 20, 2002