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Armyworms Begin to Forage Soybeans

May 23, 2017

This agronomic photo shows a fall armywormCaption: Fall armyworm

As many entomologists predicted, the mild winter and wet spring have created perfect conditions for early pressure from insects this season. Recent entomologist reports indicate that some insect populations are already approaching economic thresholds in the Mid-South.

Gus Lorenz, extension entomologist at University of Arkansas, told Syngenta Pest Patrol that he’s already received reports of a complex of armyworms, up 5 to 6 per row foot, feeding on soybean seedlings.

According to Alabama Cooperative Extension System, armyworm damage often appears suddenly. They typically feed at night undetected, but they can also feed early in the morning or during the day. When not feeding, they can be found in the debris at the base of plants or slightly under the soil.

Lorenz advises growers to scout particularly well this year due to the heavy pest pressures appearing so early in the season.

Once armyworms and other lepidopteran insects reach the state-determined economic threshold, growers should consider applying Besiege® insecticide for quick knockdown and extended residual control to grow more soybeans and maximize profit potential.

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Photo resized. Photo credit: John C. French Sr., Retired, Universities: Auburn, GA, Clemson and U of MO, Bugwood.org