Tomato-Armyworm and cutworm

Includes

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

Pest description, crop damage and life history

See:

Pest monitoring In California, in fresh market tomatoes, sampling should begin when fruit appears. A 5-minute timed search helps determine the need for treatment. On average, if one or more larvae or egg masses are found in 5 minutes, treatments may be justified.

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

  • acetamiprid
  • 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.
  • bifenthrin
  • carbaryl dust-For cutworms, apply to soil surface at first sign of activity. Do not apply to plants.
  • cyfluthrin
  • cyhalothrin
  • deltamethrin
  • esfenvalerate
  • gamma-cyhalothrin
  • kaolin-Applied as a spray to foliage, it acts as a repellent to some insect pests. Some formulations are OMRI-listed for organic use.
  • lambda-cyhalothrin
  • malathion
  • permethrin
  • plant essential oils (rosemary, etc.)-Some have demonstrated efficacy against lepidopteran larvae. Some formulations are OMRI-listed for organic use.
  • pyrethrins-Some formulations are OMRI-listed for organic use.
  • spinosad-Some formulations are OMRI-listed for organic use.
  • zeta-cypermethrin

Management-chemical control: COMMERCIAL USE

  • alpha-cypermethrin (Fastac EC) at 0.014 to 0.025 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.075 lb ai/a per season.
  • azadirachtin (Neemix)-See label for rates. Acts slowly; apply early. REI 4 hr. Thorough coverage and repeat applications are necessary. Some formulations are OMRI-listed for organic use.
  • Bacillus thuringiensis (Javelin) at 0.12 to 1.5 lb/a. PHI 0 days. Add an appropriate spreader-sticker to enhance control. most effective on small larvae. Some formulations are OMRI-listed for organic use.
  • beta-cyfluthrin (Baythroid XL) at 0.017 to 0.022 lb ai/a. PHI 0 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.132 lb ai/a per season.
  • beta-cyfluthrin/imidacloprid (Leverage 360) at 0.089 to 0.096 lb ai/a. PHI 0 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.12 lb ai/a beta-cyfluthrin or 0.24 lb ai/a imidacloprid per season.
  • bifenthrin (Brigade WSB) at 0.033 to 0.08 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 10 days. Limit 4 treatments. Do not exceed 0.32 lb ai/a per season.
  • bifenthrin/avermectin (Athena) at 0.048 to 0.116 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 10 days. Do not exceed 0.056 lb ai/a avermectin or 0.2 lb ai/a bifenthrin per season.
  • bifenthrin/imidacloprid (Brigadier) at 0.06 to 0.15 lb ai/a. PHI 1 day. REI 12 hr. Do not exceed 0.24 lb ai/a imidacloprid and 0.4 lb ai/a bifenthrin. Retreatment interval 10 days. Do not graze livestock in treated areas or cut for feed.
  • bifenthrin/zeta-cypermethrin (Hero) at 0.04 to 0.1 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 10 days. Do not exceed 0.42 lb ai/a per season. Limit 4 treatments.
  • borate complex (Prev-Am Ultra) apply at 0.4% solution. Spray to complete coverage. REI 12 hr. OMRI-listed for organic use.
  • 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, Sevin 5 Bait) at 1 to 2 lb ai/a foliar; 2 lb ai/a bait. PHI 3 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 8 lb ai/a per season.
  • chlorantraniliprole (Coragen) at 0.045 to 0.098 lb ai/a as soil, chemigation or foliar treatment. PHI 1 day. REI 4 hr. Do not exceed 0.2 lb ai/a per season. Retreatment interval 5 days for foliar and 10 days for chemigation.
  • chlorantraniliprole/lambda-cyhalothrin (Voliam Xpress) at 0.049 to 0.088 lb ai/a. PHI 5 days. REI 24 hr. Retreatment interval 5 days. Do not exceed 0.36 lb ai of lambda-cyhalothrin or 0.2 lb ai of chlorantraniliprole per acre per growing season.
  • chlorantraniliprole/thiamethoxam (Voliam Flexi) at 0.1 to 0.172 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 5 days. Do not exceed 0.172 lb ai of thiamethoxam or 0.2 lb ai of chlorantraniliprole per acre per growing season.
  • chlorfenapyr (Pylon) at 0.1 to 0.2 lb ai/a. PHI 0 days. REI 12 hr. Do not exceed 0.6 lb ai/a per season. Retreatment interval 5 days. Greenhouse only. Do not use on tomato varieties with a diameter of less than one inch when mature.
  • 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.
  • cyantraniliprole (Exirel) at 0.045 to 0.088 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 5 days. Limit 6 treatments per year. Do not exceed 0.4 lb ai/a per year.
  • cyclaniliprole (Harvanta) at 0.036 to 0.054 lb ai/a. PHI 1 day. REI 4 hr. Retreatment interval 5 days. Do not exceed 0.22 lb ai/a per year.
  • cyfluthrin (Tombstone) at 0.033 to 0.044 lb ai/a. PHI 0 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.263 lb ai/a per season.
  • cyfluthrin/imidacloprid (Leverage 2.7) at 0.08 to 0.11 lb ai/a. PHI 0 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.17 lb ai/a cyfluthrin or 0.24 lb ai/a imidacloprid per year.
  • 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 0.168 lb ai/a per season.
  • diazinon (Diazinon 50W) at 2 to 4 lb ai/a preplant. REI 2 days. One treatment per season. Cutworms only.
  • emamectin benzoate (Proclaim) at 0.008 to 0.015 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.09 lb ai/a per season.
  • esfenvalerate (Asana XL) at 0.03 to 0.05 lb ai/a. PHI 1 day. REI 12 hr. Do not exceed 0.5 lb ai/a per season.
  • gamma-cyhalothrin (Declare) at 0.0075 to 0.015 lb ai/a. PHI 5 days. REI 24 hr. Retreatment interval 5 days. Do not exceed 0.18 lb ai/a per season.
  • indoxacarb (Avaunt) at 0.065 lb ai/a. PHI 3 days. REI 12 hr. Retreatment interval 5 days. Do not exceed 0.26 lb ai/a per season. An adjuvant improves control.
  • lambda-cyhalothrin (Warrior II) at 0.015 to 0.03 lb ai/a. PHI 5 days. REI 24 hr. Retreatment interval 5 days. Do not exceed 0.36 lb ai/a per season.
  • lambda-cyhalothrin/thiamethoxam (Endigo ZC) at 0.064 to 0.072 lb ai/a. PHI 5 days. REI 24 hr. Retreatment interval 5 days. Do not exceed 0.36 lb ai/a of lambda-cyhalothrin or 0.172 lb ai/a of thiamethoxam per season.
  • methomyl (Lannate SP) 0.45 to 0.9 lb ai/a. PHI 1 day. REI 48 hr. Do not exceed 6.3 lb ai/a per season.
  • methoxyfenozide (Intrepid 2F) at 0.06 to 0.12 lb ai/a (early-season) or 0.12 to 0.25 lb ai/a (mid- to late-season). PHI 1 day. REI 4 hr. Retreatment interval 7 days. Do not exceed 1 lb ai/a per season.
  • novaluron (Rimon 0.83EC) at 0.058 to 0.078 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.23 lb ai/a per season.
  • permethrin (Loveland Permethrin and Permethrin Bait) at 0.05 to 0.2 lb ai/a foliar and 0.1 to 0.2 lb ai/a bait. PHI 0 days. REI 12 hr. Do not exceed 0.6 lb ai/a per season. Retreatment interval 7 days.
  • spinetoram (Radiant SC) at 0.039 to 0.078 lb ai/a. PHI 1 day. Retreatment interval 4 days. Do not exceed 0.266 lb ai/a per season. Limit 6 treatments per season. Do not apply to seedling fruiting vegetables grown for transplant within a greenhouse, shade house, or field plot.
  • spinosad (Success, Entrust SC) at 0.063 to 0.125 lb ai/a. PHI 1 day. REI 4 hr. Do not exceed 0.45 lb ai/a per crop. Limit 6 treatments per season. Entrust SC is OMRI-listed for organic use.
  • Spodoptera frugipereda (Fawligen) at 1 to 2.4 fl oz product per acre. PHI 0 day. REI 4 hr. Beet armyworm.
  • tebufenozide (Confirm 2F) at 0.09 to 0.12 lb ai/a early-year, or 0.12 to 0.25 lb ai/a mid- to late-year. PHI 7 days. REI 4 hr. Do not exceed 1 lb ai/a per season. Use of a spreader-binder is recommended.
  • thiamethoxam/chlorantraniliprole (Durivo) at 0.195 to 0.257 lb ai/a applied to the soil. PHI 30 days. REI 12 hr. Do not exceed 0.172 lb ai of thiamethoxam or 0.2 lb ai of chlorantraniliprole per acre per growing season.
  • zeta-cypermethrin (Mustang) at 0.028 to 0.05 lb ai/a. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.3 lb ai/a per season.

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