Abstract
Selected seed or soil treatment and foliar insecticide combinations were evaluated for control of thrips at the Macon Ridge Research Station (Franklin Parish). Plot size was four rows centered on 40-inches and 50 ft in length. Treatments were placed in a RCB design with four replications. Insecticide-treated seed, non-treated seed, and non-treated seed with Temik 15G applied infurrow were planted into a Gigger silt loam soil on 4 May. Foliar insecticides were applied on 31 May with a John Deere 5400N tractor and compressed air system calibrated to deliver 10 gpa through Teejet 80015 flat fan nozzles (2/row) at 30 psi. Insecticide efficacy was measured by randomly selecting 10 plants per plot and counting the number of thrips immatures at 20 DAP (24 May) and at 2 (2 Jun) and 7 DAT (7 Jun) after the foliar spray. Plant samples were processed using whole plant washing procedures to remove thrips. Thrips were counted using a dissecting microscope. Ten plants in each plot were visually rated for thrips injured leaves at 2 DAT (2 Jun) using a 0 (no leaf injury) to 5 (severe leaf damage) scale. Plots were harvested with a mechanical cotton harvester and seedcotton yield was taken from the center two rows of each plot. Data were subjected to ANOVA and means separated according to DMRT. Total rainfall of 4.95 inches was recorded between planting and the final efficacy rating.
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