In the San Joaquin Valley, cotton aphids have become resistant to commonly used pesticides
AuthorsElizabeth E. Grafton-Cardwell
Thomas F. Leigh
Walter J. Bentley
Peter B. Goodell
Authors AffiliationsE. E. Grafton-Cardwell is an Extension IPM Specialist and Assistant Research Entomologist in the Department of Entomology, UC Riverside, and is stationed at the UC Kearney Agricultural Center; T. F. Leigh is an Entomologist in the Department of Entomology, UC Davis; W. J. Bentley is an Entomology Farm Advisor for Kern County; P. B. Goodell is an area IPM Specialist for the South Central California Region, Cooperative Extension.
Hilgardia 46(4):4-7. DOI:10.3733/ca.v046n04p4. July 1992.
Laboratory bioassays have demonstrated that cotton aphids are resistant to organophosphate pesticides in many areas Of the Sari Joaquin Valley. Many of the aphids are resistant before they reach newly emerged cotton; their resistance tends to decline at the end of the season. The best management strategy: Avoid using pesticides in spring when they are least effective and natural enemies are abundant, and use pesticides at the end of the season to prevent sticky cotton bolls.
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