Control of Cotton Fleahopper in Cotton Using Foliar Applied Insecticides, 2019

A trial was conducted to evaluate foliar insecticides for control of cotton fleahopper in cotton. This test was conducted on a dryland commercial cotton field near Plainview, TX. The field was planted on 3 May on 40-inch row spacing. The experiment was designed as an RCB with seven treatments and four replications. The plots were four-rows wide × 40 ft. in length. Treatments were applied on 19 July during the peak bloom stage of cotton. Insecticide applications were made with a CO₂ pressurized hand-boom sprayer calibrated to deliver 11.5 GPA through hollow cone TeeJet TXVS6 spray tip nozzles (two per row) at 30 psi. Wind speed was ~9 mph during spray applications. Two drop-cloth samples (average of five plants/sample) were taken from the middle two rows of each plot at 7 DAT and 14 DAT. Numbers of CFH nymphs and adults were counted in each drop cloth sample. Data are reported as mean number of CFHs per 100 plants per plot. Data were analyzed by ANOVA and means were separated by Tukey’s mean separation.

Insecticide application had a significant impact on CFH population (Table 1). All the insecticide treatments resulted in significantly fewer CFHs compared to the untreated check on both the sample dates. No significant differences were observed among insecticide treatments.¹

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