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Controlling Armyworms (Beet and Fall Armyworms)

Category Caterpillars
These moth larva are seen to travel in groups, hence the name. They will eat a variety of crops, with some types preferring certain plants while others are less discriminating. This is a guide about controlling armyworms (beet and fall armyworms).
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Solutions

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August 12, 20060 found this helpful

Identification

Although there are many species of this pest, beet and fall armyworms are the most common species in the backyard garden. Beet armyworms are usually pale green in color with yellow stripes down the center of their backs and along their sides. Their heads have a distinct honeycomb pattern. Fall armyworms come in many colors, usually gray to yellow-green with stripes down their sides, and have a distinct inverted "Y" marking on their head. Both types of armyworms grow to a length of about 1 1/2 to 2 inches. The adult moths are a pale gray-brown color and usually lay their eggs in grasses and corn. Newly-hatched caterpillars have a looping or inchworm-like movement. Armyworms are common to the U.S. and Canada east of the Rocky Mountains.
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Favorite Plants

Armyworms attack many garden crops, deciduous trees, and shrubs.

Damage

Armyworms are voracious eaters. As eggs hatch, caterpillars start feeding on grasses and stalks and then march on to other plants as they run out of food. Armyworms feed primarily at night or during overcast skies and can easily defoliate entire plants overnight.

Organic Methods of Control:

Cultural or Mechanical

  • Cover seedlings with floating row covers until harvest.

  • Control weeds.

  • Keep grass mowed.

  • Interplant strong smelling herbs.

  • Use light traps for capturing night-flying moths.

  • Hand pick caterpillars.

Biological

  • Unleash lacewings or use nematodes as mulch.

  • Dust plants with Btk (Bacillus thuringiensis kurstaki).

Chemical

  • Spray plants with neem oil.
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Home and Garden Pest Control CaterpillarsMarch 22, 2016
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