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Armyworms are a type of turf-damaging insect pest, typically found east of the Rocky Mountains. In North America, there are a few different types of armyworms: the Common Armyworm, Fall Armyworm and Yellowstriped Armyworm. The larvae feed on all types of turf and can damage ornamentals and vegetables, as well as forage crops and cereals. Armyworms are thought to be semitropical in origin, likely from Mexico or Central America and now have taken up permanent residence in along the Gulf states. The adults, which resemble moths, will migrate north and westward during the spring and summer. Large infestations have occurred further north due to tropical storms. Turf that is damaged by armyworms will appear dry and wilted as stems of plants are completely consumed. Armyworms feed on the grass anytime during the day and are known for their voracious eating habits. They have been seen moving en masse from one turf grass area to the next eating everything that is green, leaving only a few stems. Normally the damage appears as drought damage with a wilting yellowy appearance. Starlings can sometimes be an indicator of armyworm as they like to scavenge the lawn looking for the larva to feed on. The armyworm overwinters in the larva or pupa stage in the southern regions of the United States and in the north, some larva may overwinter but most adults are blown north with spring weather fronts. In the spring, the larva pupate and the adults that arrive will mate. The females will then lay clusters of 100-300 eggs, usually on grass blades, hanging trees and shrubs or structures. Females can lay thousands of eggs, which will hatch into larvae and feed on the grass until they devour the entire plant. Then they will spread out feeding on the grass at any time during the day. Over a period of 20-48 days (depending on the temperature), they will go through 6-9 instars before pupating in the thatch and soil. Depending on the location, there can be several generations usually 2 in the north, up to 6 in the south. Proper fertilization is extremely important and Weed Man North DFW's exclusive brand of granular slow-release fertilizer ensures that the turf remains healthy all year long. Adequate nitrogen levels will help the plant recover more quickly if it is thinned out. Proper watering is also important follow Weed Man North DFW's Watering Instructions to help prevent Armyworm on your turf! Ensure when the turf is mowed it is at the recommended mowing height for your turf species, and with a sharp mower blade when the turf is dry, see our Mowing Tips.Damage
Life Cycle
Management
