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

Excerpt from Chapter 5, Field Crop Protection Guide, Order this publication

Table of Contents

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

Integrated Pest Management Options

Leaf rust blows in from the southern United States late in the season. Stem rust has common barberry as an alternate host, therefore removing this alternate host will help minimize stem rust. 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 G for Zadok's cereal growth stages.

Comments
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, another application will be necessary. A second spray may be applied before head is half emerged (Zadok's 49-55). Can be tank-mixed with several cereal herbicides. 45 days to harvest.

Comments
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. No more than 2 applications/yr. 40 days to harvest. Do not graze crop or cut for hay.

Comments
Leaf rust only. Ground or aerial. 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 per season. 48 hr re-entry period.

Comments
Ground or aerial application. Only one application per 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 per year and has been traditionally used for Fusarium control.

Comments
Ground and aerial application. Maximum of 2 applications per 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.

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Related links...

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

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