In This Section

Topics

Corn: Grey Leaf Spot (Cercospora zeae-maydis)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 28 July 2007
Pub 812: Field Crop Protection Guide > Chapter 2 : Corn > Grey Leaf Spot

Excerpt from Chapter 2, Field Crop Protection Guide, Order this publication

Table of Contents

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

Integrated Pest Management Options

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.
Seed Treatment

Chemical control not usually economical in field corn.

  Tilt 250 E Bumper 418 EC
propiconazole – Tilt 250 E, Bumper 418 EC
Active ingredient propiconazole propiconazole
Trade name Tilt 250 E Bumper 418 EC
Rate per hectare (product) 500 mL per ha 300 mL per ha
Rate per acre (product) 200 mL per ac 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.

pyraclostrobin – Headline EC
Active ingredient pyraclostrobin
Trade name Headline EC
Rate per hectare (product) 400-600 mL per ha
Rate per acre (product) 160-240 mL per ac

Comments
Ground application only. Use a minimum water volume of 100 L/ ha. For optimal disease control, begin applications prior to disease development. Do not graze treated crop within 6 days of last application. 7 days to harvest. Maximum of 2 applications/yr.

| Top of Page |

Related links...

| Top of Page |

For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca