Stagnospora Glume Blotch

Wheat-Fusarium 002

Here are the symptoms on heads are from stagosnospora (formely known as Septoria) glume blotch on triticale. We will see dark brown or purple lesions form on the heads. Lesions are often more intense at the top of the flume, with brown blotches or streaks going down to the base of the spikelet. The central stem is often not affected. UGA Extension Grain Pathologist Dr. Alfredo Martinez says, “Stagonospora  usually diminish as temperatures warm up drastically or if dry periods occur. Strobilurin and triazole fungicides are highly efficacious in controlling the disease.”

Wheat-Septoria 004

Stagnospora Glume Blotch

I also saw spores from Pyrenophora or Helminthosporium causing Tan Spot (Yellow leaf spot or Blotch). Dr. Martinez says , “This disease is more problematic in susceptible varieties, poor fertility and in fields with wheat residue left on soil surface. Initial infections come from diseased crop debris in the soil, or from diseased grass hosts. Usually the lower leaves are infected first, and the disease progresses to the upper leaves and leaf sheaths if conditions are favorable. This disease develops over a wide range of temperatures and is favored by long periods of dew or rain. Crop rotation with non-host crops reduces the severity of tan spot. Seed treatment seem to be effective in reducing the disease. Fungicides applied timely are effective in reducing the disease severity and improving yield.”

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