University of Florida

Armyworm, Beet

Spodoptera exigua

  • Adult: front wing light brownish gray with indistinct lines spanning approximately 1 in. hind wing white. Active at night. Can be monitored with pheromone traps.
  • Egg: masses of 50-75 eggs covered with a felt-like mass of scales, generally found on underside of leaves, hatch in 3 days.
  • Larva: generally green, mottled with white spots, 1 -1 1/4 in. long at maturity, often a small black spot above 2nd pair of true legs.
  • Pupa: brown, found in soil, adult emerges in 7 days.
  • Generation Time: 25-35 days.
  • Damage: occasionally larvae consume foliage and fruit.

Beet Armyworm Pictures

Beet Armyworm larva
Image #4.
Beet Armyworm, larva-


a) beet armyworm larva, with black spot over middle pair of true legs, is generally less numerous than southern armyworm but is more difficult to control;

b)
eggs of all armyworm species are laid in masses covered with scales from female's body.

Beet Army Worm Adult

Image #37.
Beet armyworm, adult-
has light brownish gray front wings with indistinct lines and are active at night.