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Efficacy of Insecticides for Control of Western Flower Thrips on Onions, 1987


 Seven insecticides were tested for control of western flower thrips (WFT) in onions grown on a Rio Grande silty clay loam near McAllen, Tex. Plots measuring 1 double-row bed by 20 ft (0.0015 acre) were arranged in a randomized block design with 4 replications. An unsprayed buffer area of 1 bed was maintained on each side of all plots. Thrips populations were assessed by counting all thrips larvae and adults on 5 plants/plot. Insecticides were applied with a COa-powered backpack sprayer that delivered 60 gal/acre at 50 psi. Applications were made on 1 and 3 Apr. Adult thrips were collected for identification before the study was initiated and after its completion and were determined to be 100% WFT prior to initiation and 95% WFT and 5% onion thrips at the end of the test. Data were analyzed using analysis of variance (ANOVA, SAS 1982) and means were separated using Duncan's New Multiple Range Test.