Tuesday, December 12, 2006 - 11:05 AM

Residual toxicity of acaricides to Galendromus occidentalis and Phytoseiulus persimilis reproductive potential

Francisco Javier Saenz-de-Cabezon Irigaray, fjsaenzdecabezon@ucdavis.edu, Frank G. Zalom, fgzalom@ucdavis.edu, and Patricia B. Thompson, pbthompson@ucdavis.edu. University of California, Entomology, One Shields Avenue, Davis, CA

The residual toxicity present on leaflets collected at each post treatment interval (3, 6, 10, 14, 17, 24, 30 and 37 days) of fenpyroximate (Fujimite®), acequinocyl (Kanemite®), etoxazole (Zeal®), spiromesifen (Oberon®), bifenazate (Acramite®) and abamectin (Agrimek®) to Galendromus occidentalis (Nesbitt) and Phytoseiulus persimilis Athias-Henriot were assessed as impact on survival, fecundity and fertility. Total effects (E) on adult female reproductive potential during a 3 day exposure to different age residues were estimated. Fenpyroximate and etoxazole were the least compatible of acaricides tested with G. occidentalis or P. persimilis field releases. Both were persistent under IOBC classification. Bifenazate and spiromesifen activities were slightly persistent to both predators. Acequinocyl was slightly persistent to G. occidentalis, but short lived to P. persimilis. Abamectin was slightly persistent to P. persimilis, but short lived to G. occidentalis.

Species 1: Acari Phytoseiidae Galendromus occidentalis (western predatory mite)
Species 2: Acari Phytoseiidae Phytoseiulus persimilis
Species 3: Acari Tetranychidae Tetranychus urticae (two-spotted spider mite)

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