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Corn: Black Cutworm (Agrotis
ipsilon)
Pub 812: Field Crop Protection
Guide > Chapter
1: Corn > Black Cutworm
Field Crop Protection Guide 2011-2012, Order
2011-2012 publication
Table of Contents
- Description
- Integrated Pest Management Options
- Soil-Applied at Planting Only
- Seed Treatment
- clothianidin - Poncho 250
- Transgenic Corn
- Bt corn - Agrisure Viptera 3110, Agrisure Viptera 3111,
Genuity SmartStax, Herculex I, Herculex XTRA, SmartStax
- Rescue Treatment
- permethrin - Ambush 500 EC, Pounce 384 EC
- cypermethrin - Ripcord 400 EC
- chlorpyrifos - Lorsban 4 E, Pyrinex 480 EC
- cyhalpthrin-lambda - Matador 120 EC, Silencer 120 EC
- chlorantraniliprole - Coragen
- Related links...
Description
Larvae are greyish-black with a paler underside and no distinct
markings on their bodies. Mature larvae are about 3.5 cm (1 1/4
in.) long and hide in the soil during the day. They can be found
near freshly cut plants, under soil clumps or along a poorly closed
seed furrow. Adult moths are grey with a small black dagger marking
on each forewing.
Image 1. Black cutworm larvae are greyish-black
with a paler underside. Mature larvae are about 3.5 cm (1.25")
long. Corn plant has been cut at the soil level.
Integrated Pest Management Options
Soil-Applied at Planting Only
Risk factors for black cutworm infestations include fields with
winter annual weeds and volunteer wheat before planting, no-till
fields or heavy soybean residue. Control annual weeds at least 3
weeks prior to planting to reduce attraction by adult moths flying
in from the south.
| Active ingredient |
tefluthrin |
| Trade name |
Force 3 G |
| Rate (product) |
37.5 g per 100 m (328 ft) row |
| Comments |
Soil-applied control is not as good as a well-timed rescue
treatment. May be applied as a banded or in-furrow application.
For banded applications, place directly in a 15-cm band ahead
of the press wheel. For in-furrow application, place all material
directly in the open seed furrow, behind the planter disc openers.
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Seed Treatment
Black cutworm is a sporadic pest. Using seed treatments specifically
for black cutworm control is not recommended unless the field has
had a continous history of cutworm injury.
| Active ingredient |
clothianidin |
| Trade name |
Poncho 250 |
| Rate (product) |
33.3 mL per 80,000 kernels |
| Comments |
For use in commercial seed treatment facilities only. Seed-applied
insecticides can affect seed drop and final plant stands. Use
talc or graphite according to planter recommendations to ensure
planting accuracy. A 30-day plantback interval for cereal grains,
grasses, soybeans and dried beans is required. |
Transgenic Corn
Use transgenic corn specifically for black cutworm
control only in those fields with a history of cutworm infestations,
as this pest is sporadic and may only require foliar control when
thresholds are reached.
| Active ingredient |
Bt corn |
| Trade name |
Agrisure Viptera 3110, Agrisure Viptera 3111, Genuity SmartStax,
Herculex I, Herculex XTRA, SmartStax |
| Rate (product) |
See Table 9-4, Transgenic Crops Expressing Insecticidal
or Fungicidal Traits, on page 119, for Bt corn options. |
| Comments |
Use Bt hybrids containing Cry1F or Vip3A only. May only control
young larvae. |
Rescue Treatments
Scout early. Black Cutworms are easier to control when larvae are
small. Look for leaf-feeding (pinholes) by young climbing larvae
as the first sign of damage. If more than 10% of plants show leaf
feeding, treating at this time will provide nearly 100% control.
| Active ingredient |
permethrin |
| Trade name |
Ambush 500 EC |
| Rate per hectare (product) |
140 mL per ha |
| Rate per acre (product) |
60 mL per ac |
| PHI* |
- |
| Comments |
Apply at seedling stage only. Apply under warm, moist
conditions in evening or night when cutworms are most active.
Do not disturb the soil for 5 days after application |
| Active ingredient |
permethrin |
| Trade name |
Pounce 384 EC |
| Rate per hectare (product) |
180 mL per ha |
| Rate per acre (product) |
73 mL per ac |
| PHI* |
- |
| Comments |
Apply at seedling stage only. Apply under warm, moist
conditions in evening or night when cutworms are most active.
Do not disturb the soil for 5 days after application |
| Active ingredient |
cypermethrin |
| Trade name |
Ripcord 400 EC |
| Rate per hectare (product) |
175 mL per ha |
| Rate per acre (product) |
70 mL per ac |
| PHI* |
21 |
| Comments |
Apply at seedling stage only. Apply under warm, moist
conditions in evening or night when cutworms are most active.
Do not disturb the soil for 5 days after application. |
| Active ingredient |
chlorpyrifos |
| Trade name |
Lorsban 4E |
| Rate per hectare (product) |
1.2-2.4 L per ha |
| Rate per acre (product) |
480-960 mL per ac |
| PHI* |
70 |
| Comments |
Apply at seedling stage only. For best results, apply
in the evening. Maximum 1 application/yr. 24-hr re-entry period. |
| Active ingredient |
chlorpyrifos |
| Trade name |
Pyrinex 480 EC |
| Rate per hectare (product) |
1.2-2.4 L per ha |
| Rate per acre (product) |
480-960 mL per ac |
| PHI* |
- |
| Comments |
Apply at seedling stage only. For best results, apply
in the evening. Maximum 1 application/yr. 24-hr re-entry period. |
| Active ingredient |
cyhalothrin-lambda |
| Trade name |
Matador 120 EC |
| Rate per hectare (product) |
83 mL per ha |
| Rate per acre (product) |
34 mL per ac |
| PHI* |
14 (silage) 21 (field & seed) |
| Comments |
Seedling stage only. Ground or aerial application.
Apply under warm, moist conditions in evening or night when
cutworms are most active. Do not disturb soil for 5 days after
application. 3 applications/season, 2 may be by air. 14 days
to harvest. |
| Active ingredient |
cyhalothrin-lambda |
| Trade name |
Silencer 120 EC |
| Rate per hectare (product) |
83 mL per ha |
| Rate per acre (product) |
34 mL per ac |
| PHI* |
14 (silage) 21 (field & seed) |
| Comments |
Seedling stage only. Ground or aerial application.
Apply under warm, moist conditions in evening or night when
cutworms are most active. Do not disturb soil for 5 days after
application. 3 applications/season, 2 may be by air. 14 days
to harvest. |
| Active ingredient |
chlorantraniliprole |
| Trade name |
Coragen |
| Rate per hectare (product) |
250 mL per ha |
| Rate per acre (product) |
101 mL per ac |
| PHI* |
14 (field corn) 1 (seed corn) |
| Comments |
Apply to foliage when rain is not expected in the next 24
hr. Use a minimum of 100 L/ha of water. Maximum 4 applications/yr.
12-hr re-entry period. |
Related links...
For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
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