1a. Objectives (from AD-416):
Evaluate new chemistries, alternative insecticide timing, improved application and enhanced sanitation to reduce navel orangeworm damage in pistachios.
1b. Approach (from AD-416):
Initially, research will be conducted within the framework of the areawide program to control navel orangeworm in almonds, pistachios and walnuts. Research will focus on evaluating the efficacy of new chemistries in combination with existing insecticides. Further efforts will evaluate postharvest insecticide applications as well as sprays in late April/early May.
3. Progress Report:
This agreement was established to support Objective 2B, of the in house project, developing insecticide spray timing recommendations for high pressure nut orchards. This is a new project and the research will focus on both overwintering survival of navel orangeworm, the principal insect pest of pistachios, as well as its survival and damage potential to the new crop. At this point in time, collections of unharvested nuts (mummies) from the previous year indicate a high overwintering population in Madera county and there are reports of high overwintering populations in Kern and Tulare counties as well. Research is ongoing to establish the timing of the different flights of navel orangeworm and the optimum time to apply chemical and biological control. This information will be used to develop a comprehensive control strategy utilizing cultural control, improved insecticide application and timing, and early harvest. A fundamental part of this strategy will be increasing the use of selective insecticides and phasing out the use of broad spectrum insecticides, with the ultimate goal of improving nut quality and boosting exports.