Corn: Fusarium (Fusarium spp.) and Gibberella (Gibberella spp.) Ear Rots

Pub 812: Field Crop Protection Guide > Chapter 1: Corn > Fusarium and Gibberella Ear Rots

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

Table of Contents

  1. Integrated Pest Management Options
  • prothioconazole - Proline 480 SC
  1. Related links...

Integrated Pest Management Options

Any of the Fusarium or Gibberella rots can establish after pollination in wounds created by insects or birds. Warm rainy weather or long dews any time after pollination may lead to ear rots in these wounded cobs. The most common and important ear mould in Ontario is Gibberella zeae, which is the sexual reproductive stage of Fusarium graminearum. Many plant pathologists believe that in years with a high occurence of fusarium head blight in wheat, the potential exists for increased gibberella ear rot in corn. These ear rots are especially important to swine and other livestock producers since they produce mycotoxins that can have a detrimental effect on the animals. Preventing ear rots is difficult since weather conditions are critical to disease development. Although some tolerant hybrids are available, none have complete resistance. Consult with your seed company and the Ontario Corn Committee Hybrid Performance Trials at for hybrid selection. Harvest fields quickly where 10% of the ears have some ear rot to limit further disease development and potential mycotoxins production.

See OMAFRA Publication 811, Agronomy Guide for Field Crops for more information.

Active ingredient prothioconazole
Trade name Proline 480 SC
Rate (product) 420 mL per 100 kg seed
PHI* 14
Comments Provides suppression only. Ground application only. Timing of application is critical. Apply from the development stage of corn between the tip of stigmata visible (silking, BBCH 63) to the stigmata drying (silk browning, BBCH 67). This product will reduce both disease symptoms and levels of mycotoxin in the grain. Maximum 1 application/yr. 24-hr re-entry period.


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For more information:
Toll Free: 1-877-424-1300
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 9 May 2011