toggle menu

Armyworm

Damage

Armyworms feed on the grass anytime during the day and are known for their voracious eating habit. 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.

Life Cycle

The armyworm over winters in the larva or pupa stage in the southern regions of the United States and in the north some larva may over winter but most adults are blown north with spring weather fronts. In the spring the larva pupate and or the adults that arrive will mate and the females will lay clusters of eggs 100-300 usually on grass tips, hanging trees and shrubs or structures. Females can lay 1000's of eggs. The eggs will hatch into larvae and feed on the grass until they devour the entire plant and then they will spread out feeding ion the grass at anytime 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 to 6 in the south.

Management

Proper fertilization is extremely important and Weed Man'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's proper 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.