Abstract
Abstract A small plot insecticide trial was conducted on the Northeast Research Station (Macon Ridge Branch) near Winnsboro, La., to compare the ovicidal activity and residual toxicity of selected insecticides against tobacco budworm and bollworm on cotton. Cotton was planted on 11 Jun in plots 4 rows (40-inch centers) × 50 ft. Treatments were arranged in a randomized complete block design and replicated 4 times. Insecticides were applied on 14 Aug with a compressed air delivery system and tractor mounted boom calibrated to deliver 5 gal total spray solution/acre through Teejet X-6 hollow cone nozzles (2/row) at 44 psi. No insecticides had been applied on those plots prior to the initiation of this trial. Eggs were collected 4 and 48 h posttreatment from the center 2 rows of each plot. Samples of freshly laid white eggs (10/plot) and a small piece of foliage to which the eggs were attached were removed from the plants and transported to the laboratory. Eggs were individually placed into 1 oz plastic cups partially filled with artificial diet for rearing tobacco budworm and bollworm. Mortality to eggs and larvae were determined 96 h after each field collection. The surviving cohort of larvae in the control treatments were reared to adults and the species composition was found to be 100% tobacco budworm. No rainfall occurred during this test.
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