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.
This trust agreement supports Objective 2.B of the parent project, reducing insect pest populations to reduce the need for post harvest treatment as well as promoting the use of selective rather than broad spectrum insecticides to control navel orangeworm. An ARS scientist at Parlier investigated the duration of control of several newly registered classes of insecticides used to control navel orangeworm in pistachios by bioassay. Egg masses were exposed to these insecticides and some had greater ovicidal activity in others. Separate bioassays are in progress evaluating the toxicity of these new insecticides when they are ingested by larvae. The insecticides under investigation include Altacor, Intrepid, bifenthrin (several formulations), lambda cyhalothring (several formulations), Proclaim, Voliam Express and several mixtures. When the insecticides were applied by a pto sprayer at 2 mph there was a dropoff in coverage above 14 feet. When insecticides were applied using an engine driven sprayer the coverage was more homogeneous.