Wheat Disease

Figure 1. Severe wheat streak mosaic in a grower’s field in Jefferson County on June 1. (Photo by Stephen Wegulo)

Protect Future Wheat Yields: Control the Volunteer Green Bridge August 2, 2017

Wheat streak mosaic virus (WSMV) problems have been extensive throughout the western Great Plains this year, significantly reducing the yield potential of many fields. A critical key in managing this threat in the next crop is elimination of volunteer wheat. Tillage or chemical weed control should occur at least one month before planting to allow host plants time to dry up and cease being a host.

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Bunted wheat and loose smut of wheat.
Figure 1 (left). Bunted wheat grain containing spore masses of the stinking smut fungi. Figure 2 (right). Loose smut on a wheat head.

The Importance of Certified, Fungicide-Treated Wheat Seed July 31, 2017

Planting clean, certified, fungicide-treated wheat seed is one of the first steps in assuring top yields from your 2018 wheat crop. Another is selecting resistant varieties, where available. Together these practices can help you more effectively manage seed-transmitted diseases of wheat.

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Figure 1.  A stripe rust susceptible (left) and resistant variety in a state variety trial in southeast Nebraska on June 3.
Figure 1. A stripe rust susceptible (left) and resistant variety in a state variety trial in southeast Nebraska on June 3.

2017 Stripe Rust Ratings from Eastern Nebraska Wheat Variety Trials July 14, 2017

This year the onset of stripe rust was earlier in eastern Nebraska than in western Nebraska, allowing it to develop to levels that could be scored in state variety trials in Washington, Saunders, and Clay counties. A table provides ratings for a number of varieties and lines at three sites.

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Plant & Pest Diagnostic Clinic Report (June 14) June 15, 2017

The following diseases were reported in samples submitted to the UNL Plant and Pest Diagnostic Lab June 1 to June 14.

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Figure 1. A Wheat Field Day in a grower’s field in Washington County on June 6.

Wheat Disease Update: Stripe Rust, Leaf Rust, Wheat Streak Mosaic at High Levels June 9, 2017

A survey of fields in south central, southeast, and northeast Nebraska shows wheat diseases increasing in severity and occurrence. Stripe rust and leaf rust have developed to severe levels in fields plant with susceptible varieties that weren't sprayed to protect the flag leaf.

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Bernd Friebe, KSU Wheat Genetics Researcher

Kansas State University Researchers Identify New Gene to Resist Wheat Streak Mosaic Virus June 9, 2017

The new gene, the third known to provide resistance, is the first that can do so at outdoor temperatures of 75° Fahrenheit and higher.

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Dead or dying wheat flag leaves due to stripe rust

Stripe Rust Predominant Disease in Nebraska Wheat May 26, 2017

In a survey of wheat fields and research plots in south central and southeast Nebraska on May 24-25, stripe rust was the predominant fungal disease found. Its increase is due to the rainfall and cool temperatures that have prevailed during the last two weeks.

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Figure 1. Severe stripe rust in a wheat field in south-central Nebraska May 24. (Photo by Stephen Wegulo)

Stripe Rust Increasing in Nebraska Wheat May 25, 2017

Recent rainfall and cool temperatures have favored development of stripe rust to severe levels on flag leaves in fields that have not been sprayed as shown in Figure 1, a photo taken Wednesday, May 24, in a grower’s field in Webster County in south-central Nebraska. 

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