Cereals: Wheat: Dwarf Bunt (Tilletia controversa)

Pub 812: Field Crop Protection Guide > Chapter 4: Cereals > Wheat: Dwarf Bunt

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

Table of Contents

  1. Integrated Pest Management Options
      • difenoconazole + metalaxyl-M – Dividend XL RTA
      • carbathiin + thiram – Vitaflo 280
  2. Related links...

Integrated Pest Management Options

Seed Treatment

Wheat infected with dwarf bunt will be substantially shorter than healthy plants. Infected seed has a "fishy" smell. Dwarf bunt occurs on winter wheat, primarily in counties bordering Goergian Bay and Lake Huron where snow cover is deep and persistant in late winter and early spring. Plant seed that is free of bunt spores (black). Treat seed when bunt has been observed in the crop. Cut the crop high when harvesting. Raising the header reduces the amount of bunt balls being harvested. Ensure good coverage of fungicide seed treatment on the seed. Avoid planting wheat in fields with soil-borne dwarf bunt for 5-7 years, since fungus is very persistent.

Active ingredient difenoconazole + metalaxyl-M
Trade name Dividend XL RTA
Rate (product) 325-650 mL per 100 kg seed
Comments For both commercial seed treatment plants and on-farm treatment using standard gravity flow- or mist-type seed treatment equipment. May also be used in treat-on-the-go seeder. Do not graze, feed green forage or cut for hay within 35 days of planting.


Active ingredient carbathiin + thiram
Trade name Vitaflo 280
Rate (product) 230-330 mL per 100 kg seed
Comments For control of seed-borne dwarf bunt only. Do not graze or feed livestock on treated areas for 6 weeks after planting.


Related links...


For more information:
Toll Free: 1-877-424-1300
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 16 May 2011