Corn: Helminthosporium Leaf Spot (Cochliobolus carbonum)

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Pub 812: Field Crop Protection Guide > Chapter 1: Corn > Helminthosporium Leaf Spot

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

Table of Contents

1. Integrated Pest Management Options

• propiconazole - Tilt 250 E, Bumper 418 EC

2. Related links...

Integrated Pest Management Options

This disease is not generally a problem in Ontario since hybrids with resistance are available. Consult with your seed company and the Ontario Corm Committee Hybrid Performance Trials at www.gocorn.net for hybrid selection. Crop rotation and tillage will reduce inoculum levels in surface residues. In reduced tillage systems, rotation and resistance are necessary. Chemical control is usually not economical in field corn but may be necessary if a very susceptible seed corn inbred is used.

Active ingredient	propiconazole
Trade name	Tilt 250 E
Rate per hectare (product)	250-500 mL per ha
Rate per acre (product)	100-200 mL per ac
PHI*	14
Comments	Ground and aerial application. Apply when rust pustules first appear. Under severe disease pressure, a second application 14 days later may be necessary. Only in seed corn, under severe disease pressure can a third application be made 14 days later. Can be tank mixed with Ripcord or Matador insecticide for insect control.

 

Active ingredient	propiconazole
Trade name	Bumper 418 EC
Rate per hectare (product)	150-300 mL per ha
Rate per acre (product)	60-121 mL per ac
PHI*	14
Comments	Ground and aerial application. Apply when rust pustules first appear. Under severe disease pressure, a second application 14 days later may be necessary. Only in seed corn, under severe disease pressure can a third application be made 14 days later. Can be tank mixed with Ripcord or Matador insecticide for insect control.

 

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Related links...

• Agronomy Guide for Field Crops - Publication 811
• Disease
• Corn