Walnut aphid becoming a costly midsummer pest
G. Steven Sibbett, University of California
Larry J. Bettiga, University of California
Marion Bailey, University of California
California Agriculture 36(5):21-22. DOI: 10.3733/ca.v036n05p21.
G. Steven Sibbett is Farm Advisor; University of California Cooperative Extension, Tulare County, Visalia. Larry Bettiga is Staff Research Associate; University of California Cooperative Extension, Tulare County, Visalia. Marion Bailey is Field Assistant. University of California Cooperative Extension, Tulare County, Visalia.
Controls for codling moth suppress aphid parasite, allowing undisturbed population growth.