Abstract
The efficacy of selected insecticide treatments was evaluated against fall armyworm at the Macon Ridge Research Station near Winnsboro, LA. The soil type for this trial consisted of a Gigger-Gilbert silt loam soil with a pH = 6.1 and 1.1% organic matter. Cotton was planted on 5 May into plots that were four rows centered on 40-inches and 50 feet in length. Treatments were arranged in a RCB design with three replications. On 25 Jul, treatments were applied using a compressed air system calibrated to deliver 10 gpa through Teejet 80015 flat fan nozzles (2/row) at 30 psi. One hour following insecticide application, three first position squares from the upper third of a plant were harvested and placed in a plastic Petri dish. In addition, one first position and quarter-sized boll from the mid-canopy of a plant was placed in a 1 oz plastic cup. For both tissues harvested, 10 plants were sampled in each plot. Each plastic dish was infested with five 2-d-old larvae and 1oz cups were infested with one 5-d-old larva. Mortality was determined at 72 and 96 h after infestation (HAI). Data were analyzed using ANOVA and means were separated according to DMRT. No rainfall occurred during the test.
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