Greenhouse Evaluation of Imidacloprid-Treated Seed for Control of Yellow Sugarcane Aphid on Sorghum Seedlings, 1993

The effectiveness of imidacloprid-treated sorghum seed for control of yellow sugarcane aphid was evaluated in a re-search greenhouse at Texas A&M University. Seed treated with 1, 2, 3, and 4 oz (AI)/cwt of imidacloprid was sown in 110-mm germination pots containing a prepared soil mixture of peat, vermiculite, and perlite in a 2:1:1 ratio, respectively. There were 10 single-seedling replications for each rate of imidacloprid. Plants were infested 3, 10, and 31 d after emergence (DAE) with 10, 15, and =21 yellow sugarcane aphids, respectively. An initial count of yellow sugarcane aphids was made 4 h after plant infestation (HAI). Subsequent counts of yellow sugarcane aphids were made 1,3,5, and 7 d (and 14 d for those infested 31 DAE) after infestation (DAI). Percent control was calculated by using the Henderson and Tilton (1955) formula. Data were analyzed statistically by using ANOVA and LSD.