Greenbug Control on Grain Sorghum, 1984

Four soil-applied insecticides were evaluated for greenbug control on ‘Pioneer 8222’ variety grain sorghum planted 30 Mar on a Raymondville clay loam on 40-inch rows at the TAMU-Hoblitzelle Farm near Mercedes, Texas. Treatments were arranged in a randomized complete block design with 4 replications. Experimental plots were 50 ft by 6 rows. All treatment were applied in-furrow at planting with a Gandy applicator. The additional side-dress application was made 45 days post-plant. All plots were furrow irrigated on 2 Apr, 2 May and 15 Jun. Plant populations were estimated on 17 Apr from plant counts in three 10-ft samples/plot. Greenbug populations were estimated weekly by checking 10 randomly selected plants/plot. Beginning 15 May, sample size was reduced to 5 plants/plot. One application of Lorshan (0.25 lb Al/acre) was applied to control sorghum midge at ca. 50% bloom.