Control of Hessian Fly with Seed Treatments, 1990

Abstract

Abstract Seed treatments of dimethoate, Orthene 75 S, and NTN 33893 240 FS were compared to standard in-furrow treatments of Di-Syston 15 G and Thimet 15 G for HF efficacy. The test was planted 26 Oct in Barnwell County, SC, on a Dothan sandy loam. The experimental design was a randomized complete block with 5 replicates. The experimental unit was a plot 50 × 5.3 ft (8 rows on 8 inch spacing). Granular Di-Syston and Thimet were placed in-furrow with electric Gandy applicators mounted centered on the drill. Orthene 75 S seed treatments were applied by thoroughly mixing the appropriate amt of dry insecticide with 5 lb of seed in a plastic bag. Dimethoate (Clean Crop 2.67 EC) seed treatments were diluted with the appropriate amt of water, to a total vol of 30 ml and thoroughly mixed with 5 lb of seed in a plastic bag. The NTN 33893 treated seed were provided by Mobay and were from a different seed lot of the same variety. All other treatments were from the same bag of seed. Phytotoxicity evaluations were made at 11 and 19 d after planting by taking stand counts from two random 1 m row samples per plot. HF efficacy was evaluated by uprooting 10 randomly selected plants from each of 4 plots (40 plants/treatment) and examining them in the laboratory for larvae and puparia. The middle 6 rows were harvested with an Almaco plot combine for yield and test wt. All yields were corrected to 13.5% moisture.