Corn Earworm (Helicoverpa zea) and Fall Armyworm (Spodoptera frugiperda)
Generally, corn earworm (CEW) and fall armyworm (FAW) are late-season pests and are likely to only be a problem in fall peas. See the Sweet Corn insect control section for more information on CEW and FAW.
IRAC Group 1:
- carbaryl (Sevin XLR Plus): 0.5 to 1.5 qt/A CEW, 1 to 1.5 qt/A FAW; PHI 3d fresh, 21d dry, REI 12h, Bee: H, Group 1A. Do not apply to crops or weeds in bloom. Use on succulent or shelled peas prohibited.
IRAC Group 3:
- alpha-cypermethrin (Fastac* CS): 2.7 to 3.8 oz/A CEW, 3.2 to 3.8 oz/A FAW; PHI 1d fresh, 21d dry, REI 12h, Bee: H.
- bifenthrin (Brigade* 2EC): 2.1 to 6.4 oz/A; PHI 3d fresh, 14d dry, REI 12h, Bee: H.
- esfenvalerate (Asana* XL): 5.8 to 9.6 oz/A; PHI 3d fresh, 21d dry, REI 12h, Bee: H. Not for armyworm on dry peas.
- gamma-cyhalothrin (Declare*): 1.02 to 1.54 oz/A; PHI 7d fresh, 21d dry, REI 48h, Bee: H. Use higher rates for large armyworm larvae.
- lambda-cyhalothrin (Warrior* II): 1.28 to 1.92 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H. Use higher rates for large armyworm larvae.
- lambda-cyhalothrin + chlorantraniliprole (Besiege*): 6 to 10 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H, Groups 3A & 28. Use higher rates for large larvae.
- zeta-cypermethrin (Mustang* Maxx): 2.72 to 4 oz/A CEW, 3.2 to 4 oz/A FAW; PHI 1d fresh, 21d dry, REI 12h, Bee: H.
IRAC Group 5:
- spinetoram (Radiant SC): 4 to 8 oz/A; PHI 3d fresh, PHI 28d dry, REI 4h, Bee: M.
- spinosad (Entrust SCOG): 4 to 6 oz/A; PHI 3d fresh, 28d dry, REI 4h, Bee: M.
IRAC Group 11:
- Bacillus thuringiensis aizawai (XenTariOG): 0.5 to 2 lb/A; PHI 0d, REI 4h, Bee: L. Must be ingested. For resistance management, may be rotated with Bt kurstaki products (Dipel). For armyworms only.
- Bacillus thuringiensis kurstaki (Dipel DFOG): 0.5 to 2 lb/A; PHI 0d, REI 4h, Bee: L. Must be ingested. For resistance management, may be rotated with Bt aizawai products (XenTari-armyworms only).
IRAC Group 18:
- methoxyfenozide (Intrepid 2F): For FAW, 4 to 8 oz/A early season on young plants, 8 to 16 oz/A for mid- to late-season; For CEW, 10 to 16 oz/A; PHI 7d, REI 4h, Bee: L. Suppression only for CEW.
IRAC Group 22:
- indoxacarb (Avaunt): 3.5 oz/A; PHI 7d, REI 12h, Bee: H. Southern dried pea only. CEW only.
IRAC Group 28:
- chlorantraniliprole (Coragen): 5 to 7.5 oz/A soil at planting, 3.5 to 7.5 oz/A foliar; PHI 1d, REI 4h, Bee: L.
- chlorantraniliprole + lambda-cyhalothrin (Besiege*): 6 to 10 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H, Groups 28 & 3A. Use higher rates for large larvae.
IRAC Group UN:
- Chromobacterium subtsugae strain PRAA4-1 (GrandevoOG): 1 to 3 lb/A; PHI 0d, REI 4h, Bee: M.
Cutworms
Cutworms are caterpillars that hide under the soil surface adjacent to the plant stem during the day and feed on stems after dark. For best results, make application between midnight and dawn while cutworms are feeding aboveground. Synthetic pyrethroids (Group 3A) may work best during cool spring weather. See the Pepper and Tomato (Outdoor) insect control sections for more information on black and variegated cutworms.
IRAC Group 1:
- carbaryl (Sevin XLR Plus): 1 to 1.5 qt/A; PHI 3d fresh, 21d dry, REI 12h, Bee: H, Group 1A. Do not apply to crops or weeds in bloom. Use on succulent or shelled peas prohibited.
- methomyl (Lannate* LV): 1.5 to 3 pt/A; PHI 1d, REI 48h, Bee: H, Group 1A. Variegated cutworm only.
IRAC Group 3:
- alpha-cypermethrin (Fastac* CS): 1.3 to 3.8 oz/A; PHI 1d fresh, 21d dry, REI 12h, Bee: H.
- bifenthrin (Brigade* 2EC): 2.1 to 6.4 oz/A; PHI 3d fresh, 14d dry, REI 12h, Bee: H.
- esfenvalerate (Asana* XL): 5.8 to 9.6 oz/A; PHI 3d fresh, 21d dry, REI 12h, Bee: H.
- fenpropathrin (Danitol* 2.4EC): 10.66 oz/A; PHI 7d, REI 24h, Bee: H. For black, variegated and climbing cutworms.
- gamma-cyhalothrin (Declare*): 0.77 to 1.28 oz/A; PHI 7d fresh, 21d dry, REI 48h, Bee: H.
- lambda-cyhalothrin (Warrior* II): 0.96 to 1.6 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H.
- lambda-cyhalothrin + chlorantraniliprole (Besiege*): 5 to 8 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H, Groups 3A & 28.
- zeta-cypermethrin (Mustang* Maxx): 1.28 to 4 oz/A; PHI 1d fresh, 21d dry, REI 12h, Bee: H.
IRAC Group 5:
- spinosad (SeduceOG): 20 to 44 lb/A, 0.5 to1 lb/1000 sq ft.; PHI 3d fresh, 28d dry, REI 4h, Bee: M. Spread bait on soil around plants.
IRAC Group 28:
- chlorantraniliprole and lambda-cyhalothrin (Besiege*): 5 to 8 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H, Groups 28 & 3A.
Pea Aphid (Acyrthosiphon pisum)
The pea aphid is light green with unusually long legs and cornicles (tailpipe-like projections). It is the primary aphid that attacks peas, fava beans, and lentils. This aphid overwinters as an egg on alfalfa, vetch, and clover and moves to peas in the spring. Live female nymphs are produced throughout most of the year. Females take 12 days to mature and produce up to 150 nymphs. There are 13–20 generations per year. Populations tend to be lower after cold, snowless winters or springs with persistent wet weather. Infestations during the bloom and early pod stages will reduce yield and crop quality by removing plant sap, impairing pod appearance, reducing seed fill, impairing nitrogen fixation, and by the presence of aphid honeydew. Start monitoring when plants begin to flower. Action thresholds include 1–2 aphids per leaf, 2–3 aphids per stem tip, or 9–13 per sweep, if a sweep net is being used. Harvest or spray nearby alfalfa, vetch, or clover before winged adults are formed in the spring. Varieties differ in their susceptibility to pea aphid damage. There are many natural enemies (lady beetles, lacewings, flower fly larvae, predatory midges, braconid wasps) that help reduce aphid numbers. Fungi will control high aphid populations during warm, humid, or wet weather. A single systemic insecticide application will control this pest.
IRAC Group 1:
- dimethoate (Dimethoate 4EC): 0.3 pt/A; PHI 0d, REI 48h, Bee: H, Group 1B.
- malathion (Malathion 57 EC): 1.5 to 1.6 pt/A; PHI 3d, REI 12h, Bee: H, Group 1B.
- methomyl (Lannate* LV): 1.5 to 3 pt/A; PHI 1d, REI 48h, Bee: H, Group 1A.
IRAC Group 3:
- bifenthrin (Brigade* 2EC): 2.1 to 6.4 oz/A; PHI 3d fresh, 14d dry, REI 12h, Bee: H.
- esfenvalerate (Asana* XL): 2.9 to 5.8 oz/A; PHI 3d fresh, 21d dry, REI 12h, Bee: H.
- gamma-cyhalothrin (Declare*): 1.02 to 1.54 oz/A; PHI 7d fresh, 21d dry, REI 48h, Bee: H. See resistance management statement on label.
- lambda-cyhalothrin (Warrior* II): 1.28 to 1.92 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H. See resistance management statement on label.
- lambda-cyhalothrin + chlorantraniliprole (Besiege*): 6 to 10 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H, Groups 3A & 28. See resistance management section on label.
- pyrethrin (PyGanic EC5.0OG): 4.5 to 15.61 oz/A, or 0.25 to 0.5 oz/gal and 3 gal/1000 sq ft in greenhouse for backpack sprayers; PHI 0d, REI 12h, Bee: M.
IRAC Group 4:
- acetamiprid (Assail 30SG): 2.5 to 5.3 oz/A; PHI 7d, REI 12h, Bee: M, Group 4A. Not for dry peas.
- flupyradifurone (Sivanto): 7 to 14 oz/A; PHI 7d, REI 4h, Bee: L, Group 4D.
- imidacloprid (Admire Pro): 7 to 10.5 oz/A soil, 1.2 oz/A foliar; PHI 21d soil, 7d foliar, REI 12h, Bee: H, Group 4A.
- thiamethoxam (Cruiser 5FS): 1.28 oz/100 lb seed; REI 12h, Bee: H, Group 4A. Systemic seed treatment. For early-season protection from aphids.
IRAC Group 8:
- sodium tetraborohydrate decahydrate (Prev-AM): 100 oz/100 gal; REI 24h, Bee: L, Group 8D. Do not apply in midday sun or mix with copper.
IRAC Group 28:
- chlorantraniliprole and lambda-cyhalothrin (Besiege*): 6 to 10 oz/A; PHI 7d fresh, 21d dry, REI 24h, Bee: H, Groups 28 & 3A. See resistance management section on label.
IRAC Group UN:
- Chromobacterium subtsugae strain PRAA4-1 (GrandevoOG): 2 to 3 lb/A; PHI 0d, REI 4h, Bee: M.
- insecticidal soap (M-PedeOG): 1.25 to 2.5 oz/gal water; PHI 0d, REI 12h, Bee: L. Use in combination with specified rate of another labeled product. Do not mix with sulfur. Not for sweet peas.
Seedcorn Maggot (Delia platura)
See the Beans: Snap, Lima, and Dry insect control section for information on seedcorn maggot.