Beet, table-Armyworm and cutworm

Includes

Beet armyworm (Spodoptera exigua)
Bertha armyworm (Mamestra configurata)
Black cutworm (Agotis ipsilon)
Variegated cutworm (Peridroma saucia)
Western yellowstriped armyworm (Spodoptera praefica)

Pest description, crop damage and life history

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Management-cultural control

Weed control is important. Lambsquarters and wild mustard attract egg-laying females and provide a source of food for larvae. Fall tillage can help destroy overwintering pupae.

Home gardeners: Control weeds, grasses, and debris in the vegetable garden that provide cover; hand-pick cutworm larvae, using a flashlight to find them, if practical. Scratch the soil at the base of plants to find larvae in the daytime.

Management-chemical control: HOME USE

  • azadirachtin (neem oil)-Some formulations are OMRI-listed for organic use.
  • Bacillus thuringiensis var. kurstaki (Btk)-Some formulations are OMRI-listed for organic use.
  • Beauvaria bassiana-Some formulations are OMRI-listed for organic use.
  • carbaryl
  • cyfluthrin
  • kaolin-Applied as a spray to foliage, it acts as a repellent to some insect pests. Some formulations are OMRI-listed for organic use.
  • plant essential oils (peppermint, rosemary, etc.)-Some have demonstrated efficacy. Some formulations are OMRI-listed for organic use.
  • pyrethrins (often combined with other ingredients)-Some formulations are OMRI-listed for organic use.
  • spinosad
  • zeta-cypermethrin

Management-chemical control: COMMERCIAL USE

Apply any one of these materials to the soil surface at first sign of cutworm activity. Consult label. Minimum preharvest interval (PHI) varies with crop. Difficult to control. Where cutworms are on the soil surface, a carbaryl drench (when bees are not present) may help.

  • alpha-cypermethrin (Fastac EC) at 0.008 to 0.025 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 4 days. Do not exceed 0.075 lb ai/a per season. Leaves cannot be used for food or feed.
  • Bacillus thuringiensis (Javelin) at 0.12 to 1.5 lb ai/a. PHI 0 days. REI 4 hr. Armyworms only. Add an appropriate spreader-sticker to enhance control. Most effective on small larvae. Some formulations are OMRI-listed for organic use.
  • bifenthrin (Brigade WSB) at 0.08 to 0.1 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.4 lb ai/a per year.
  • bifenthrin/zeta-cypermethrin (Hero) at 0.025 to 0.1 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.45 lb/a per season. Leaves cannot be used for food or feed.
  • Burkholderia spp. (Venerate XC) at 1 to 8 quarts/a product. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • carbaryl (Sevin 4F or Sevin 5 bait) at 1 to 2 lb ai/a. PHI 7 days. REI 12 hr. Do not exceed 6 lb ai/a per crop. Retreatment interval 7 days.
  • chlorantraniliprole (Coragen) at 0.045 to 0.098 lb ai/a. PHI 1 day. REI 4 hr. Retreatment interval 3 days. Do not exceed 0.2 lb ai/a per season. Limit 4 treatments per season.
  • Chromobacterium subtsugae (Grandevo) at 0.3 to 0.9 lb ai/a per 100 gal. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • deltamethrin (Delta Gold) at 0.012 to 0.028 lb ai/a. PHI 3 days. REI 12 hr. Retreatment interval 3 days. Do not exceed 0.14 lb ai/a per season. Tops not for human or animal consumption.
  • diazinon (Diazinon AG500) at 2 to 4 lb ai/a at preplant broadcast and incorporate. REI 3 days. Toxic to birds, fish and other wildlife.
  • GS-omega/kappa-Hxtx-Hv1a (Spear Biological Insecticide) at 0.8 lb ai/a. PHI 0 days. REI 4 hr. Do not exceed 2 lb ai/a per year. Armyworms only.
  • indoxacarb (Avaunt) at 0.065 to 0.11 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 3 days. Do not use adjuvants. Do not exceed 0.44 lb ai/a per crop. Do not use adjuvant. Limit 4 treatments per year.
  • malathion (Malathion 8) at 1.25 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 7 days. Limit 3 applications.
  • methomyl (Lannate SP) at 0.45 to 0.9 lb ai/a. PHI 0 days for roots, and 10 days for tops. REI 48 hr. Do not exceed 3.6 lb ai/a or eight applications per year.
  • methoxyfenozide (Intrepid 2F) at 0.12 to 0.25 lb ai/a. PHI 1 day. REI 4 hr. Do not exceed 1 lb ai/a per season. Retreatment interval 14 days.
  • spinetoram (Radiant SC) at 0.047 to 0.063 lb ai/a. PHI 7 days. REI 4 hr. Retreatment interval 7 days. Limit 4 applications per crop. Do not exceed 0.25 lb ai/a per season.
  • spinosad (Success, Entrust SC) at 0.07 to 0.156 lb ai/a. PHI 3 days. REI 4 hr. Retreatment interval 7 days. Treat eggs at hatch and small larvae. Do not exceed 4 applications or 0.33 lb ai/a per crop. Armyworm only. Spinosad takes several days to achieve full effect. Monitor fields and pest populations carefully. Multiple applications may be necessary. Entrust SC is OMRI-listed for organic use.
  • zeta cypermethrin (Mustang) at 0.016 to 0.05 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 4 days. Do not exceed 0.3 lb ai/a per season. Tops and roots cannot be used for food or feed.

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