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Resistance

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Bt resistant armyworms migrating north

To date, fall armyworms have not been a major crop pest in North Carolina, since they can’t survive a winter freeze. Studies have shown that these insects often migrate north from Florida, and this year they were found in North Carolina corn fields as early as May. The real fear is that these Bt-resistant armyworms will move from corn to cotton.

Industry

Multiple herbicide-resistant weeds and the challenges ahead

The evolution and widespread distribution of herbicide-resistant weeds and their management is a challenge for crop producers and land managers. The evolution of herbicide-resistant weeds is not new. The first report dates back to 1970, when common groundsel (Senecio vulgaris) resistant to atrazine was confirmed in Washington. Recently, multiple-resistance was confirmed in Palmer amaranth (Amaranthus palmeri) in a continuous seed corn production field in Nebraska.

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