Soil systemic insesticides for control of western flower thrips and lettuce aphid on romaine lettuce, 2023

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Abstract
The objective of the trial was to compare the efficacy of 2 soil-applied, systemic insecticides to control western flower thrips and lettuce aphid under desert growing conditions. Romaine lettuce ‘Del Sol’ was direct seeded on 1 Mar 2023 at the Yuma Agricultural Center into beds on 42-inch centers with 2 seed lines per bed. Stand establishment was achieved using overhead sprinklers and irrigated with furrow irrigation thereafter. Plots were 2 beds wide by 45 ft long and bordered by 2 untreated beds. Four replications of each treatment were arranged in an RCB design. Formulations and rates for each compound are provided in the tables. Subsurface, soil injection application of each treatment was applied by placing the insecticides 1.5 inches directly below each seed line with a modified fertilizer shank just prior to planting in a total water volume of 20.5 gpa. No other insecticides were applied during the trial. Numbers of WFT from 5 plants per replicate were recorded at 7-day intervals beginning 21 days after planting (DAP).