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Cereals: Wheat: Loose Smut (Ustilago tritici)

Author: OMAFRA Staff
Creation Date: 04 July 2005
Last Reviewed: 15 June 2009
Pub 812: Field Crop Protection Guide > Chapter 4: Cereals > Wheat: Loose Smut

Excerpt from Chapter 4, Field Crop Protection Guide, Order this publication

Table of Contents

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

Integrated Pest Management Options

This fungus infects the embryo at flowering, thus it is seed-borne. Light rains or heavy dew and moderate temperature, 15°C-16°C (58°F-60°F) during flowering favour infection. Sow pedigree seed. This disease was quite important in Ontario wheat production but the incidence and hence its impact have been reduced substantially due to the effectiveness of fungicide seed treatments. Good coverage of seed with fungicide seed treatment is important.

Seed Treatment

carbathiin + thiram – Vitaflo 280
Active ingredient carbathiin + thiram
Trade name Vitaflo 280
Rate (product) 330 mL per 100 kg seed

Comments (Days to harvest, label precautions, etc.)
Do not graze or feed livestock on treated areas for 6 weeks after planting.

tebuconazole + thiram – Raxil T
Active ingredient tebuconazole
Trade name Raxil T
Rate (product) 225 mL per 100 kg seed

Comments (Days to harvest, label precautions, etc.)
Do not graze or feed livestock on treated areas for 4 weeks after planting.

difenoconazole + metalaxyl-M – Dividend XL RTA
Active ingredient difenoconazole + metalaxyl-M
Trade name Dividend XL RTA
Rate (product) 325-650 mL per 100 kg seed

Comments (Days to harvest, label precautions, etc.)
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 55 days of planting.

triadimenol – Baytan 30
Active ingredient triadimenol
Trade name Baytan 30
Rate (product) 50 mL per 100 kg seed

Comments (Days to harvest, label precautions, etc.)
Must be diluted with water prior to treatment of seed to ensure uniform coverage. Treated seed will sometimes emerge more slowly than untreated. Avoid late seeding of winter cereals. Do not graze or feed livestock on treated areas for 40 days after planting.

triticonazole + thiram – Gemini
Active ingredient triticonazole + thiram
Trade name Gemini
Rate (product) 360 mL per 100 kg seed

Comments (Days to harvest, label precautions, etc.)
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 use seed for food, feed or oil processing.

Related links...

 

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