Corn: Western Bean Cutworm (Striacosta albicosta)

Pub 812: Field Crop Protection Guide > Chapter 1: Corn > Western Bean Cutworm

Field Crop Protection Guide 2011-2012, Order 2011-2012 publication

Table of Contents

  1. Integrated Pest Management Options
    • Transgenic Corn
      • Agrisure Viptera 3110, Agrisure Viptera 3111, Genuity SmartStax, Herculex I, Herculex XTRA, SmartStax
    • Foliar Treatment
      • cyhalothrin-lambda - Matador 120 E
      • deltamethrin - Decis 5.0 EC
  2. Related links...

Integrated Pest Management Options

Transgenic Corn

Plant the appropriate refuge for the Bt corn trait used and follow all insect resistance management strategies mandated by the Canadian Food Inspection Agency.

For more information regarding Bt corn and/or refuge options, see the Canadian Corn Pest Coalition website, found at

Active ingredient  
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 Bt corn hybrids containing Vip3A provide full control. Bt corn hybrids containing Cry1F provide some control. Some ear feeding may still occur and could result in ear rot (mycotoxin) development. YieldGard Bt corn varieties (Cry 1Ab) do not control westerm bean cutworm.


Foliar Treatment

Use pheromone traps to monitor for pest presence and peak flight. Focus scouting efforts on the top three-to-four leaves of the plant. Look for egg masses and young larvae. Eggs hatch one or two days after turning purple. Spray is warranted if 5% of the plants have eggs or small larvae. Spray is only effective on small larvae, prior to them entering the ear. Additional impact on quality can be expected from ear rots and secondary pests that may enter and feed on the damaged ears.

Additional information on pest status and management recommendations is provided at the Ontario WBC Trap Network.

Active ingredient cyhalothrin-lambda
Trade name Matador 120 E
Rate per hectare (product) 83-187 mL per ha
Rate per acre (product) 34-76 mL per ac
PHI* 14 (silage) 21(field and seed)
Comments Ground and aerial application. For best results, apply in early morning, before temperatures rise, or during the evening. Use 100-200 L water/ha for ground application, 10-40 L water/ha are aerial application. Spray no later than 10 days after egg hatch. Maximum 3 applications/yr. Do not apply more than 2 applications of 83 mL/ha by air. 24-hr re-entry period.


Active ingredient deltamethrin
Trade name Decis 5.0 EC
Rate per hectare (product) 250-300 mL per ha
Rate per acre (product) 100-120 mL per ac
PHI* 1
Comments Ground application only. Apply when egg masses begin to hatch. Use at least 240 L water/ha. Maximum 3 applications/yr. Do not feed silage or stubble to dairy cattle. 12-hr re-entry period.


Related links...


For more information:
Toll Free: 1-877-424-1300
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 10 May 2011