1. Insect
  2. Vegetable Crops
  3. Vegetable Crops
  4. Hosts and Pests of Vegetable Crops

Bean, dry-Corn earworm

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Image related to Bean, dry-Corn earworm
Corn earworm
Helicoverpa zea Boddie
Immature showing damage
© Ken Gray Insect Image Collection
Image related to Bean, dry-Corn earworm
Corn earworm
Helicoverpa zea Boddie
Adult
© Ken Gray Insect Image Collection
Image related to Bean, dry-Corn earworm
Corn earworm
Helicoverpa zea Boddie
Immature showing damage
© Ken Gray Insect Image Collection

Helicoverpa zea

Pest description, crop damage and life history

See:

Common Pests of Vegetable Crops

Management-biological control

Many predators and parasites attack corn earworm eggs, including several species of Trichogramma wasps. Most parasitized eggs turn black, but there may be a lag period before they do so. Commercial releases of Trichogramma wasps have been used with mixed results. Generalist predators such as lacewings, minute pirate bugs, and damsel bugs feed on corn earworm eggs and small larvae.

  • HCNPV (Gemstar LC) at 4 to 10 fl oz formulated product. PHI 0 days. REI 4 hr. A liquid concentrate biological insecticide for control of corn earworm.

Management-chemical control: HOME USE

  • azadirachtin (neem oil)-Some formulations are OMRI-listed for organic use.
  • Bacillus thuringiensis var. kurstaki (Btk)
  • carbaryl
  • esfenvalerate
  • plant essential oils (rosemary, etc.)-Some formulations are OMRI-listed for organic use.
  • pyrethrins (often combined with other ingredients)-Some formulations are OMRI-listed for organic use.
  • spinosad-Some formulations are OMRI-listed for organic use.
  • zeta-cypermethrin

Management-chemical control: COMMERCIAL USE

  • acephate (numerous products) at 0.75 to 1 lb/a. PHI 14 days. REI 24 hr. Do not feed treated vines. Do not exceed 2 lb ai/a per year.
  • beta-cyfluthrin (Baythroid XL, Tombstone Helios) at 0.019 to 0.025 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 14 days. Do not exceed 0.05 lb ai/a per season. Do not feed treated vines or hay to livestock. Toxic to bees, fish and aquatic invertebrates. Only registered for use in WA
  • chlorantraniliprole (Coragen) at 0.045 to 0.065 lb ai/a. PHI 1 day. REI 4 hours. Do not exceed a total of 0.2 lb ai of chlorantraniliprole per season.
  • esfenvalerate (Asana XL) at 0.03 to 0.05 lb ai/a. PHI 21 days. REI 12 hr. Do not exceed 0.2 lb ai/a per year. Do not feed or graze treated vines.
  • lambda-cyhalothrin (Warrior II) at 0.02 to 0.03 lb ai/a. PHI 21 days. REI 24 hr. Do not graze or feed to livestock. Do not exceed 0.12 lb ai/a per year. Do not apply within 25 ft of an aquatic habitat, 150 ft if applied by air.
  • methomyl (Lannate SP) at 0.45 to 0.9 lb ai/a. PHI 14 days for harvest, feeding vines, and hay. REI 48 hr. Do not exceed 4.5 lb ai/a per year.
  • spinetoram (Radiant SC) at 0.0313 to .0625 lb ai/a. PHI 28 days. REI 4 hr. Retreatment interval 4 days. Do not exceed six applications or 0.094 lb ai/a per season. Follow resistance management procedures on the label.
  • spinosad (Success) at 0.06 to 0.09 lb ai/a. PHI 28 days. REI 4 hr. Treat eggs at hatch and small larvae. Do not exceed 0.188 lb ai/a per year. Do not feed forage or hay to livestock. Spinosad takes several days to achieve full effect. Monitor fields and pest populations carefully. Multiple applications may be necessary. Some formulations are OMRI-listed for organic use.
  • zeta-cypermethrin (Mustang; Mustang Max) at 0.017 to 0.025 lb/a (Mustang Max) or 0.035 to 0.05 lb ai/a (Mustang). PHI 21 days. REI 12 hr. Retreatment interval 5 days. Do not exceed 0.15 lb ai/a (Mustang Max) or 0.3 lb ai/a (Mustang) per year. Do not apply by foliar application within 25 ft of an aquatic habitat, or 150 ft if applied by air.