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Wheat Foliar Disease Update

Just a quick update on wheat leaf rust: leaf rust was observed on an early-planted, highly susceptible variety in the UGA CAES Southwest Georgia Research and Education Center in Plains GA on April 2. There are no indications or reports of wheat leaf rust in other areas of GA. However, environmental conditions are becoming conducive for leaf rust epidemics to develop. Therefore, field monitoring for leaf rust and/or Stagonospora (leaf-glume blotch) in your area is advised.

Fungicide Selection

For an effective and longer lasting protection a mix of the triazole and strobirulin is suggested. Always good to have a dual family chemistries rather than more of the same chemical families.

When rust has become established in a field, triazole fungicides tend to be most effective. Strobilurins have a more preventive activity and tend to be weaker if rust already in the field. However triazoles protection last less in the plant (maybe 14 days in the plant) while strobirulins protection last longer in the plant (21-27 days in the plant).

triazoles

metconazole (Caramba)

propiconazole (Tilt, Propimax)

prothioconazole (Proline)

prothioconazole + tebuconazole (Prosaro)

tebuconazole-containing products (Folicur, others)

Strobilurins

azoxystrobin (Quadris)

fluxastrobin (Evito)

picoxystrobin (Aproach)

pyraclostrobin (Headline)

Dual or  Mixed mode of action –

fluoxapyroxad + pyraclostrobin (Priaxor)

propiconazole + azoxystrobin (Quilt, QuiltXcel)

propiconazole + trifloxystrobin (Stratego)

prothioconazole + trifloxystrobin (Stratego YLD)

pyraclostrobin + metconazole (Twinline)

tebuconazole + trifloxystrobin (Absolute)

A complete list of wheat fungicides, rates and specific remarks and precautions can be found on page 58 of the 2013-14 Wheat Production Guide or on page 484 of the 2014 Georgia Pest Management Handbook. Always read product label for fungicide applications restrictions. Take a look at pages 9 to 11 of the 2013-14 Wheat Production Guide for wheat variety responses against leaf rust.

http://www.caes.uga.edu/commodities/fieldcrops/gagrains/documents/2013-14WheatProductionGuide.pdf

For more information on wheat leaf rust go to

http://plantpath.caes.uga.edu/extension/plants/fieldcrops/WheatLeafRust.html