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ARS Home » Pacific West Area » Parlier, California » San Joaquin Valley Agricultural Sciences Center » Commodity Protection and Quality Research » Research » Research Project #429224

Research Project: Population Dynamics and Epidemiology of Navel Orangeworm Damage to Pistachios

Location: Commodity Protection and Quality Research

Project Number: 2034-43000-040-14-T
Project Type: Trust Fund Cooperative Agreement

Start Date: Apr 1, 2015
End Date: Mar 31, 2020

Objective:
The focus of this proposal is twofold. First, to control navel orangeworm using optimal insecticide spray timing. Second, to identify factors associated with unacceptable navel orangeworm damage, as defined by the processor and grower.

Approach:
The key points in the population dynamics of navel orangeworm in Madera County have been identified. They occur at 1,700; 2,200; 2,700; and 3,200 degree days (DD) from January 1. These spray timings need to be evaluated further in Madera County and extended to other counties. The epidemiology portion of this proposal will follow two tracks. First, use existing database to calculate multiple regression equations to assess the contribution of percent split, percent shell damage, percent dark stain and percent blank to navel orangeworm nut damage. The second track will utilize classic Case-Control statistics. Processors will identify ranches with high damage and they will be paired with 4-6 similar ranches that have acceptable damage.