AgWeb released information on May 12 about the challenges and strategies for managing cotton bollworm pressure during the critical months of July and August. The report outlines how increased pest pressure and reduced susceptibility to Bt traits in some areas have made controlling cotton bollworm more complex, emphasizing the need for consistent scouting, awareness of economic thresholds, and timely interventions.
Cotton bollworm (Helicoverpa armigera) is described as an economically significant pest capable of causing yield losses between 1% and 1.5% in certain regions. Early identification is crucial to ensure that management efforts target the correct pest species. The adult moth lays eggs on various parts of the plant, with larvae able to hatch within three days. As they develop, larvae can move deeper into fruiting structures where they are harder to control.
The article details recommended scouting practices: “During peak summer pressure, scout at least weekly, increasing to every two to three days as activity builds.” Economic thresholds differ based on crop type; before bloom in non-Bt cotton it is ten eggs or five small worms per 100 plants between July and August, while Bt cotton uses a threshold of ten worms per 100 plants. Thresholds also change depending on crop stage and regional conditions.
Bt traits have helped reduce insecticide use but are not always fully effective due to observed reductions in susceptibility in some regions. Regular scouting remains important even for Bt varieties: “Bt cotton should still be scouted regularly to confirm performance.” When intervention becomes necessary, targeting early instar larvae with appropriate insecticides increases effectiveness.
Cultural practices such as managing nitrogen levels and maintaining consistent irrigation are suggested as part of an integrated pest management approach but do not replace regular scouting or treatment decisions. Experts recommend consulting seed retailers or extension agents when making insecticide decisions.
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