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P-IE

Student Competition 10-Minute Paper

Grad 10-min: P-IE, IPM Field Crops 1

Chemigation efficacy and spray deposition on corn for the control of western bean cutworm

On-Demand
Student Competition On-Demand
Striacosta albicosta is a critical pest in corn that can cause significant yield loss by feeding on the developing ears. In Nebraska, one of the main practices used against this pest is aerial insecticide application, although some apply insecticides through the center pivot irrigation system, known as chemigation. However, application failures have been reported with both methods, and there are limited data available to support recommendations for chemigation targeting S. albicosta. Therefore, field studies were conducted to determine the efficacy of chemigation using different insecticides and application methods on the control of S. albicosta and determine spray deposition. First, a tracer dye (PTSA) was applied through the irrigation system at low and high carrier volumes of water (0.25 and 0.75 acre-inches). Plastic jars positioned at ear and tassel height were used to collect chemigation samples. Leaves from the same height as jars were also collected. Samples were analyzed by fluorimeter. Next, bifenthrin and chlorantraniliprole insecticides were applied at their low and high label rates and at the low and high carrier volumes. Plastic jars and leaves were used to collect insecticide samples like tracer applications. S. albicosta populations were monitored by pheromone traps and in-field scouting, with corn ears assessed for feeding damage 28 DAT. PTSA application results indicated that 0.25 ac-in carrier volume provided greater deposition efficiency compared to 0.75 ac-in. Additionally, application of the low chlorantraniliprole and high bifenthrin rates at 0.25 ac-in carrier volume provided the best control for this pest.