Pyrethroid resistance persists in spider mite predator
Marjorie A. Hoy, University of California, Berkeley
Nancy F. Knop, Department of Entomology, Berkeley
John L. Joos, Sonoma, Lake, Marin, Mendocino, and Napa counties
California Agriculture 34(11):11-12. DOI: 10.3733/ca.v034n11p11.
Spider mite predators laboratory-selected for pyrethroid resistance successfully overwintered in a northern California apple orchard.A laboratory strain of spider mite predator resistant to low rates of pyrethroids became established and successfully overwintered in a northern California apple orchard.
Marjorie A. Hoy is Associate Professor of Entomology and Associate Entomologist, University of California, Berkeley; Nancy F. Knop is a graduate student in the Department of Entomology, Berkeley; John L. Joos is Area Research Farm Advisor for Sonoma, Lake, Marin, Mendocino, and Napa counties.
We thank FMC, ICI Americas, and Shell Development for, respectively, the permethrin, fenvalerate, and SD-57706 materials used. This project was supported in part by Pear Zone I, the Almond Board of California, the California Raisin Advisory Board, the California Table Grape Commission, and Experiment Station Project No. 3522-H. We thank S. C. Hoyt and R. Downing for providing colonies of M. occidentalls, D. Culver for use of an almond orchard, and Haven Best for use of his Sebastopol apple orchard. K. Smith, M. Mochizucki, and D. Castro provided technical assistance.