Armyworm - Euxoa auxiliaris
UC - Davis, Pests of the Garden and Small Farm University of Georgia Archives
- Puplication #3332 The University of Georgia, www.ipmimages.org
DESCRIPTION: Adults are 1½ inch moths with dark gray wings. Larvae are tan, green, or black, 1½ inches long, and have an inverted “Y” on their heads.
LIFE CYCLE: The caterpillars overwinter and emerge in early spring, when they do their heaviest damage. After several weeks, they enter the soil, pupate, and emerge as 'miller-type' moths. There is one generation per year.
Traps: Blacklight traps catch male and female moths; pheromone traps catch only the males. Both traps are most effective as indicators of population levels.
Mechanical: Use floating row covers, being sure to remove them when plants bloom so that pollination is not hindered. (Remay has been shown to be the most effective type of floating row cover for these types of pests.)
Biological: Scout your plants every 2 to 3 days; apply BtK in granular or ES (emulsifiable suspension) form if 20% of leaves have "shot holes" in them, being particularly attentive to the undersides of the leaves. (BtK is most effective on small larvae, 1/4 to 3/4 inch long, in their first instar.) See Bacillus Thuringiensis.
FOR CORN: Spray directly to leaf whorls, and to silks after they have wilted. Apply Dipel (Bt) at 1 lb/A or Xentari at 1.5 lb/A. For late plantings, apply Xentari once at tassel; hand apply a corn oil/Bt mix directly to corn silks. Apply any of the various horticultural oils to ear tips 4 - 5 days after the silks wilt to discourage worms already present.
Botanical: Spray ryania or rotenone/pyrethrin in the evening.