Cereals: Wheat: Rust (Leaf - Puccinia triticina and Stem - P. graminis f. sp. tritici)

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

Table of Contents

1. Integrated Pest Management Options
   • pyraclostrobin – Headline EC
   • azoxystrobin + propiconazole - Quilt
   • propiconazole – Tilt 250 E, Bumper 418 EC
   • prothioconazole - Proline
   • tebuconazole – Folicur 432 F
   • trifloxystrobin + propiconazole – Stratego 250 EC
   • mancozeb – Dithane DG, Rainshield NT
2. Related links...

Integrated Pest Management Options

Leaf rust blows in from the southern U.S. late in the season. Minimize stem rust by removing its alternate host, common barberry. Use tolerant or resistant varieties. There are many different phenotypes (races), and wheat varieties vary in their resistance/tolerance. The development of new races could result in a once-resistant variety becoming susceptible over time. Use foliar treatments when flag leaf has 5-10 pustules (1% leaf area).

See Appendix F , Cereal Growth Stages, on page 91.

pyraclostrobin – Headline EC

Comments (Days to harvest, label precautions, etc.)
Leaf rust only. Ground and aerial application. Apply only up to flag leaf fully emerged stage (Zadok's 39). Do not apply at boot stage (Zadok's 47) and beyond. Maximum 2 applications/season.

azoxystrobin + propiconazole - Quilt

Comments (Days to harvest, label precautions, etc.)
Ground and aerial application. Apply once between stem elongation (Zadok’s 29–37) and half-head emergence (Zadok’s 49–55). Maximum 1 application/season. 45 days to harvest for grain and straw. Do not harvest for forage. When expecting high disease pressure from stripe rust and wheat leaf rust, use the higher application rate of 1 L/ha.

Comments (Days to harvest, label precautions, etc.)
Ground and aerial application. Apply at early signs of disease from the beginning of stem elongation (Zadok's 29-37). If conditions favourable to disease continue, apply again, if necessary, before head is half emerged (Zadok's 49-55). Can be tank-mixed with several cereal herbicides. 45 days to harvest.

prothioconazole - Proline

Comments (Days to harvest, label precautions, etc.)
Ground application only. Use as a preventative when earliest disease symptoms appear on the leaves and stems. Recommended to be used with the registered non-ionic surfactant, Agral 90 or AgSurf at 0.125% vol/vol. Maximum 2 applications/yr with a mimimum 7-day interval between applications. Do not apply within 30 days of harvest.

tebuconazole – Folicur 432 F

Comments (Days to harvest, label precautions, etc.)
Ground and aerial application. Only 1 application/year. Apply only up to flag leaf fully emerged stage (Zadok's 39). Do not apply at boot stage (Zadok's 47) and beyond. Use non-ionic surfactant such as Agral 90 or Agsurf at 0.125% vol/vol. 36 days to harvest.

Before using Folicur for wheat leaf diseases, consider that Folicur can only be applied once/year and has been traditionally used for Fusarium control.

trifloxystrobin + propiconazole – Stratego 250 EC

Comments (Days to harvest, label precautions, etc.)
Ground and aerial application. Maximum 2 applications/year. Do not apply the second application within 14 days of the first. Apply only up to flag leaf fully emerged stage (Zadok's 39). Do not apply at boot stage (Zadok's 47) and beyond. Can be tankmixed with Buctril M in wheat. 45 days to harvest.

Comments (Days to harvest, label precautions, etc.)
Leaf rust only. Use lower rate for applications at Zadok's 12-21 growth stage, when crop is in 3rd leaf to tillering. Higher rate for applications at Zadok's 59 growth stage when head is fully emerged but prior to flowering. Maximum 2 applications/yr. 40 days to harvest. Do not graze crop or cut for hay.

Related links...

• Agronomy Guide for Field Crops - Publication 811
  • Cereal: Rust
• Appendix G: Cereal Growth Stages
• Diseases
• Cereals