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Corn: Eye Spot (Aureobasidium zeae)

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

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

Table of Contents

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

Description

The disease produces characteristic round or oval spots (1-4 mm (1/16-1/8 in.)) with a tan/brown centre and a brown or purple margin. A translucent yellow halo forms around the margin, and when held to the sun, the lesions resemble an eye. Leaf blighting may occur when these lesions join, killing large portions of leaf tissue. The disease may be confused with non-infectious physiological leaf spots or insect damage.

Image 1. Eyespot causes round or oval leaf spots with a tan/brown centre, a brown or purple margin, and a translucent yellow halo when held up to the sun.
Image 1. Eyespot causes round or oval leaf spots with a tan/brown centre, a brown or purple margin, and a translucent yellow halo when held up to the sun.

Integrated Pest Management Options

Many resistant or tolerant commercial hybrids are available. 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 but may be necessary if a very susceptible seed corn inbred is used.
  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.

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