MISSISSIPPI SOYBEAN PROMOTION BOARD PROJECT NO. 37-2013 (YEAR 1) ANNUAL REPORT Title: Characterization of the Resistance Potential for the Diamide Insecticides, Belt (flubendiamide) and Prevathon (chlorantraniliprole). PI: Jeff Gore, [email protected]CO-PI's: Angus Catchot, Don Cook, Natraj "Krish" Krishnan, and Trent Irby EXECUTIVE SUMMARY Bollworm, tobacco budworm, fall armyworm, and beet armyworm populations remain highly susceptible to the diamide class of chemistry, and no tolerant populations were found. In general, all populations and species were more susceptible to Prevathon than Belt. With beet armyworm, colonies are being selected at three concentrations of Belt that represent low, moderate, and high doses to determine the influence of selection pressure on the evolution of resistance. Currently, five generations have been selected. To date, none of the selections have resulted in a resistant colony. Prevathon moved into new plant tissue and provided better systemic control of bollworm than did Benevia and Belt at all rating intervals. Prevathon provided excellent systemic control out to 32 DAT. Benevia appeared to provide systemic control as well, but control declined at each subsequent rating interval. Based on these data, Belt does not appear to move into new plant parts like Prevathon. At 25 DAT, all of the insecticides resulted in greater than 90% mortality. At 32 DAT, Prevathon still provided 100% mortality, while mortality declined with Benevia and Belt. However, Benevia and Belt both provided very good residual control at 32 DAT. BACKGROUND AND OBJECTIVES This is a graduate student project to gain a better understanding of bollworm and other caterpillar pest resistance to the diamide insecticides, Belt and Prevathon. This is a new class of chemistry that provides unprecedented knockdown and residual control of caterpillar pests. As a result of their long residual control, it appears that there is a high probability of resistance development to this class of insecticides. Basic and applied research is needed to understand the biological properties of these insecticides to ensure their longevity in soybean production systems in Mississippi. Additionally, research is needed to determine their optimum use strategies in Mississippi soybean production systems. Objective 1: To quantify the variation in the response of bollworm to the diamide insecticides.
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MISSISSIPPI SOYBEAN PROMOTION BOARD PROJECT NO. …...Objective 4: This objective will be conducted during years 2 and 3 of the project using populations from objective 2 after multiple
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MISSISSIPPI SOYBEAN PROMOTION BOARD
PROJECT NO. 37-2013 (YEAR 1)
ANNUAL REPORT
Title: Characterization of the Resistance Potential for the Diamide Insecticides, Belt
(flubendiamide) and Prevathon (chlorantraniliprole).