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Must be mixed with water and applied as a foliar spray with ground or aerial equipment for conventional spraying or by chemigation. Chromobacterium subtsugae (Grandevo, Grandevo PTO, Grandevo WDG - insect-killing bacterium) at 0.3 to 0.9 lb ai/A.Some formulations OMRI-listed for organic use. No contact action larvae must eat treated leaves. Biological insecticide most effective against small, newly hatched larvae. Bacillus thuringiensis kurstaki (Biobit HP, Crymax, Deliver, Dipel DF, Javelin WG, and others - live spores of an insect-killing bacterium)-See label for rates.Some formulations are OMRI-listed for organic use.

Bacillus thuringiensis aizawai (Agree WG, XenTari - live spores of an insect-killing bacterium)-See label for rates.We do not yet know enough about arthropod natural enemies to suggest practical ways of manipulating and enhancing their effects other than avoiding any unnecessary insecticide applications. Older plants can tolerate considerable defoliation without any economic loss of root yield or sucrose content.Īrmyworms commonly are attacked by parasitic wasps and flies that can help keep infestations in check. Consider insecticide application if field scouting shows that infestations average one armyworm larva per plant early in the season.

Scouting and thresholds No formal economic thresholds exist for armyworm insecticide treatment decisions in sugar beets. They are about 1.5 inches long when mature. Western yellowstriped armyworms have wide, velvety black stripes along the back with many narrower, bright yellow stripes along the sides.

They are about 1.25 inches long when mature. They are about 1.25 inches long when mature.īertha armyworms are highly variable, from light yellow-green to gray-black, with a yellow-orange stripe along the side that divides the caterpillar body into a dark upper half and a pale bottom half. When infestations become dense and crowded, larvae migrate together from field to field sugar beets adjoining infested alfalfa hay fields or cereals may be completely defoliated by migrating armyworms.īeet armyworms are dull green caterpillars with a dark, broad stripe along each side and many smaller, light wavy lines down the back. Armyworms are related closely to cutworms but generally are slightly larger, more brightly colored, and actively feed on plants during the day. Damage appears as skeletonized leaves with only leaf veins and petioles remaining. Pest description and crop damage Armyworms occasionally are severe defoliators, especially in western Idaho. Western yellowstriped armyworm ( Spodoptera praefica)