Abstract
Abstract A full-season field evaluation was conducted at the Red River Research Station, Bossier City, LA, to determine the efficacy of various insecticides and combinations in controlling Heliothis spp. on cotton. Plots were 4 rows × 30.5 m and were arranged in a randomized complete block with 4 replications. Cotton was plated 16 Apr on 1.02-m centers. Insecticides were applied with a high-clearance sprayer equipped with a COa system for spraying small plots. Insecticides were applied in 11.4 liters of water/acre with TX-3 hollow cone nozzles spaced 50.8 cm apart. Treatments were applied on 16, 29 Jul, 5, 12, 19 and 26 Aug. All plots were oversprayed on 17 May with Bidrin 8M (0.10 lb (AI)/acre) for thrips and on 13 and 25 Jun with Orthene 75S (0.1875 lb (AI)/acre) for plant bugs. Insect populations and plant damage were monitored 2-3 days following each insecticide application by examining 25 terminals and 25 squares/plot. Terminal counts (eggs and larvae) were not made following the last application date. Yields were determined by mechanically harvesting the center 2 rows from each plot on 11 Oct and 21 Nov. Insect data presented are seasonal means.
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