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Evaluation of Insecticides and Spray Carrier to Control Sorghum Midge in South Texas


 Two experiments were conducted in 4-row by 50-ft plots of grain sorghum planted 25 Mar at the TAMU-Hoblitzelle Farm near Mercedes, TX. The experimental ilesign was a randomized complete block with 4 replications. Insecticides were delivered through a CO2 powered boom mounted on a high clearance sprayer calibrated to deliver 25 gpa (3 TX 10 hollow-cone nozzles per row, 30 psi, 3 mph). Treatments in the first test were applied on a 3-day schedule (29 May, 2 Jun, and 5 Jun) and treatments in the second test were sprayed on a 6-day schedule (29 May and 5 Jun). In test 2, each insecticide was applied either in water or in water with an emulsifiable oil added (Valoil). Efficacy was evaluated by measuring yield and rating heads for damage using a 1-10 scale, based on the % seed damaged in each panicle. Sample size for yield consisted of hand-harvesting seed heads within 26.4 ft of row/plot, machine threshing them, and adjusting grain weights to 15% moisture.