The search for efficacious insecticides to control citricola scale (Coccus pseudomagnoliarum) in citrus

Citricola scale, Coccus pseudomagnoliarum, has become a major pest in citrus. Citrus yield can be significantly reduced if densities of adult females exceed 1 per twig. In the past, citricola scale could be easily controlled by organophosphate and carbamate insecticides. Recently, we have found evidence of organophosphate resistance developing in San Joaquin Valley citricola scale populations. New insecticide chemistries are needed that can control citricola scale and at the same time preserve the natural enemies for other citrus pests. This talk summarizes the current research on the efficacy and selectivity of insecticides for citricola scale control.