Abstract
The objective of the study was to evaluate the efficacy of various neonicotinoid insecticides for control of early season insect pests on iceberg head lettuce under desert growing conditions. Head lettuce ‘Mohawk M.I.’ was direct seeded on 10 Sep 2009 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 40 ft long and bordered by one untreated bed. Five replications of each treatment were arranged in a RCB design. Insecticidal compounds, formulations and application rates along with treatment dates are provided in Table 1. The in-furrow, atplanting application of Venom 20 SG was injected 2 inches below the seed on 10 Sep. Durivo was applied as a band-drench at the base of lettuce plants on 13 Jan 2010. All other insecticide treatments were foliar sprays applied with a Lee Spider Spray TracTractor 4-row sprayer with three TJ-6
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