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

  1. Description
  2. Integrated Pest Management Options
    • Soil-Applied at Planting Only
      • tefluthrin - Force 3 G
    • 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
  3. 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.
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.

 


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
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 10 May 2011