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Pest Alert: AR Corn Earworm Egg Lay Nears Hatching

August 2, 2019
This illustrated image shows a bollworm

Corn earworms, also known as cotton bollworms, have left a large egg lay in the southern half of AR. The flight remains ongoing, with corn earworms starting to appear further north. In his latest update, Pest Patrol entomologist Dr. Gus Lorenz reports that most soybean fields in southern AR will need a foliar insecticide application, and that growers further north should be diligently scouting their fields.

Late-planted soybeans are most vulnerable to corn earworm infestations, while soybeans that bloom before the July-August moth flight tend to avoid moth egg lay. According to the University of Arkansas Cooperative Extension Service, smaller larvae stick to blooms and new leaves, but larger larvae will feed on any part of the plant. When scouting, look for smaller nymphs that are off-white, and larger caterpillars that are yellow, green, brown or black in color, with markings on their backs.

If corn earworm pressure reaches the state-determined economic threshold, we suggest Besiege®, a broad-spectrum insecticide that provides fast knockdown and fights off destructive lepidopteran pests like corn earworm across a broad range of crops.

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