Abstract
The objective of the study was to evaluate the efficacy of various diamide insecticides used as soil versus foliar sprays for control of early season insect pests on iceberg head lettuce under desert growing conditions. Head lettuce ‘Keeper’ was direct seeded on 3 Sep 2010 at the University of California Desert Research and Extension Center, El Centro, CA into double row beds on 40 inch centers. Stand establishment was achieved using overhead sprinkler irrigation, and irrigated with furrow irrigation thereafter. Plots were four beds 13.3 ft wide by 50 ft long and bordered by one untreated bed. Four replications of each treatment were arranged in a RCB design. Insecticidal compounds, formulations and application rates are provided in Tables 1-5. The in-furrow, at-planting application were injected 2 inches below the seed in 15.6 gpa H2O on 2 Sep 2010 prior to planting and the foliar sprays were applied using a Lee Spider Spray Trac Tractor 4-row sprayer with three TJ-6
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