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Corn: Southern Corn Leaf Blight (Cochliobolus heterostrophus)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 15 June 2009
Pub 812: Field Crop Protection Guide > Chapter 1: Corn > Southern Corn Leaf Blight

Excerpt from Chapter 1, Field Crop Protection Guide, Order this publication

Table of Contents

  1. Integrated Pest Management Options
  2. Related links...


Integrated Pest Management Options

This disease is becoming more common in Southwestern Ontario. Some hybrids are tolerant/resistant to the disease. Crop rotation and tillage will reduce inoculum levels in surface residues. In reduced tillage systems, rotation and resistance are necessary. Chemical control usually not economical in field corn.

azoxystrobin + propiconazole – Quilt
Active ingredient azoxystrobin + propiconazole
Trade nameQuilt
Rate per hectare (product)0.75-1.0 L per ha
Rate per acre (product) 305-406 mL per ac

Comments
Ground and aerial application. Apply when disease first appears, followed by a second application 14 days after the first, if environmental conditions are favourable for disease development. Do not apply to field corn or field corn grown for seed after brown silk. 30 days to harvest for forage. 14 days to harvest for sweet corn. Maximum 2 applications per season.

 Tilt 250 EBumper 418 EC
 propiconazole – Tilt 250 E, Bumper 418 EC
Active ingredient propiconazolepropiconazole
Trade nameTilt 250 EBumper 418 EC
Rate per hectare (product)250 - 500 mL per ha 150 - 300 mL per ha
Rate per acre (product)100 - 200 mL per ac60 - 121 mL per ac

Comments
Ground and aerial application. Apply when disease first appears. Can be tank mixed with Ripcord or Matador insecticide for insect and disease control. 14 days to harvest.

Related links...

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