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Title: TOXICOLOGICAL STUDIES OF TWO INSECT GROWTH REGULATORS ON GEOCORIS PUNCTIPES, ORIUS INSIDIOSUS AND COLLOPS VITTATUS

Author
item Naranjo, Steven
item PRABHAKER, NILIMA - UCR, RIVERSIDE, CA

Submitted to: Sweetpotato Whitefly Progress Review Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 4/1/2002
Publication Date: 6/1/2002
Citation: N/A

Interpretive Summary:

Technical Abstract: Laboratory experiments were continued to evaluate the direct effects of two insect growth regulators (IGR), buprofezin (chitin synthesis inhibitor) and pyriproxyfen (JH analog), on survival and reproduction of Geocoris punctipes, Orius insidiosus and Collops vittatus, 3 common generalist predators found in cotton. Both topical and contact residue assays were performed on adults and terminal-stage nymphs at recommended field rates of the materials. Buprofezin was found benign to all species and stages of exposure in terms of survivorship and reproduction. This is consistent with previous dose-response studies with G. punctipes where is was impossible to estimate lethal concentrations. Pyriproxyfen applied to adults had no effect on survival or reproduction of G. punctipes or O. insidiosus. However, egg viability, but not survival, of C. vittatus appeared to be affected by pyriproxyfen. Pyriproxyfen applied to terminal nymphal stages of G. punctipes and O. insidiosus caused some mortality and adult deformities compared to the control. Pyriproxyfen did not affect egg viability of treated adults or adults arising from treated nymphs of either of these species.