cabbage webworm
cabbage webworm

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*This is an excerpt from Insect Pest Scouting for Crucifer Crops, ANR-2241

Identification

Adult beetles are 5 mm long and dark brown with a yellow wing margin; eggs are bright orange, oval shaped, and laid in masses; caterpillars are dark brown with black head; body is covered with stout hair.

Plant Injury

Adult beetles and caterpillars cause extensive leaf feeding and crop damage occurs rapidly; also feed on exposed tubers of turnips and radishes.

Sampling Method & Economic Threshold

  • Early detection and management will prevent rapid colonization of this pest.
  • Look for adult beetles that migrate into the field during late September or early October. Early morning or late evening when beetles are most active is the best time to scout.
  • Highly attracted to turnips and napa cabbage compared to other crucifers.
  • Turnips should be scouted at least weekly to detect rapidly growing populations (turnip and napa cabbage can be used as a trap crop).

 

Read here to learn more about Insect Pest Scouting for Crucifer Crops.

Download a PDF of Insect Pest Scouting for Crucifer Crops, ANR-2241.

 

*This is an excerpt from Insect Pest Scouting for Crucifer Crops, ANR-2241

Identification

Brightly colored bugs with piercing-sucking mouthparts (orange, red, and yellow patterns on adults); eggs are barrel-shaped with black bands on top; overwinter as adults.

Plant Injury

Nymphs and adults feed on leaf veins causing extensive browning or wilting of leaves; extensive feeding will cause plants to wilt and die.

Sampling Method & Economic Threshold

  • Look for colorful adults or masses of nymphs feeding together.
  • ET (Georgia) = 1 adult bug per 10 plants.

ET = Economic Threshold (number of insects above which there will be economic losses)

 

Read here to learn more about Insect Pest Scouting for Crucifer Crops.

Download a PDF of Insect Pest Scouting for Crucifer Crops, ANR-2241

 

*This is an excerpt from Insect Pest Scouting for Crucifer Crops, ANR-2241

Identification

Small insects that jump readily using muscles in their hind legs; hind legs appear swollen.

Plant Injury

Common in spring on seedlings; shot-hole feeding symptoms on small leaves.

Sampling Method & Economic Threshold

  • Use a good quality magnifying lens when scouting seedling.
  • Shot-hole leaf injury is distinctive.
  • Scout on field edges that usually get the worst damage from flea beetles.
  • No economic thresholds are available.
  • Young plants are susceptible to flea beetle damage.

 

Read here to learn more about Insect Pest Scouting for Crucifer Crops.

Download a PDF of Insect Pest Scouting for Crucifer Crops, ANR-2241.

 

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