True Armyworms are a different species than the Fall Armyworm and are easy to differentiate. have three yellow stripes running down their back with a dark band on either side of the stripe and grow to a length of about 2 inches. They are the caterpillar life stage of a moth; the moth form is tan to gray-brown with a wingspan of 1½" and a single white dot in the center of both forewings.
In North America, they are found most profusely in the Rocky Mountains. They rarely do damage in any other area of North America. They are a pest of grain in this region, preferring barley, millet, oats, rye, sorghum and wheat. They will also attack grasses such as alfalfa and Timothy.
Pheromone traps and lures. are very effective for monitoring and reducing the reproduction rate of these pests.
For control, sprays with Bacillus thuringiensis kurstaki. are the best option. For more information please see our Caterpillars and Moths Control page.
For control products and more information please see our Caterpillars and Moths Control page.