Abstract
Abstract Selected insecticides were evaluated for sorghum midge control at the Texas Agricultural Experiment Station Research Farm near College Station, TX. Seed of hybrid grain sorghum (ATx399 X RTx430) was planted 16 May on rows spaced 30 inches apart. Insecticide treatments were compared in plots, 6 rows X 40 ft long, arranged in a RCB design with 4 replications. Insecticides were applied to the middle 2 rows of plots. Insecticides were applied between 0800 and 0900 h CDT by using a hand-held backpack sprayer with TX-3 hollow cone nozzles at 35 psi, producing a finished spray volume of 4.9 gpa. Insecticides were first applied when 30-50% of the panicles were flowering; insecticides were applied on 15, 19, and 23 Jul. Adult sorghum midge abundance was assessed just prior to each application by counting the number of sorghum midges on 10 individual sorghum panicles enclosed in clear plastic bags. The panicles were cut from the plant and returned to the laboratory for examination and sorghum midge counts. Grain yield data were collected from the 2 middle rows per plot. Panicles were hand harvested from 2 selected 8.75-ft sections of row/plot and mechanically threshed. Data were statistically analyzed by using ANOVA and LSD.
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