Abstract
Post-bloom insecticide sprays for control of peach twig borer, Anarsia lineatella Zeller, and San Jose scale, Quadraspidiotus perniciosus (Comstock), were timed to larval and crawler emergence using precise day-degree (DD) accumulations after male moth or scale collections in pheromone traps. Optimum timing for peach twig borer treatment was 400 DD after first moth emergence in California; optimum timing for San Jose scale was 600-700 DD after first male scale emergence. These techniques for pest control in commercial orchards may help reduce pesticide usage by avoiding multiple sprays to the same pest generation, and improve coordination of sprays with other orchard operations.
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