Wheat Disease

Figure 1. Figure 1. The wheat-mite-virus complex has extreme potential to impact yield the following year if high risk volunteer wheat situations are not managed well
Figure 1. Figure 1. The wheat-mite-virus complex has extreme potential to impact yield the following year if high risk volunteer wheat situations are not managed well. (Photo by Gary Hein)

Why Control of Volunteer Wheat is Critical to Protecting 2020 Yields

July 12, 2019
Volunteer wheat can create a "green bridge," providing a route for mites to move to and infest emerging wheat. These mites can then transmit wheat streak mosaic virus, High Plains virus, and Triticum mosaic virus, or all of them to create a complex of infections.

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Wheat head with fusarium head blight

Why Did Fusarium Head Blight Develop in My Wheat Field after I Sprayed at Flowering?

June 28, 2019
Some wheat growers who treated for fusarium head blight at flowering (the optimum timing) with a triazole fungicide (the most effective fungicide class for this disease) are wondering why they aren't seeing the control they expected this year.

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Stripe rust and leaf rust on wheat

Wheat Disease Update

June 28, 2019
The latest field surveys in southeast, south central, and southwest Nebraska showed varying levels of wheat diseases that are favored by excessive moisture.

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Field of wheat with severe fusarium head blight
Figure 1. A Nebraska wheat field with severe Fusarium head blight. (Photos by Stephen Wegulo)

Strategies for Handling Wheat Grain Affected by Fusarium Head Blight

June 25, 2019
Excessively wet field conditions are contributing to the development of Fusarium head blight (scab) in some wheat fields. The disease is characterized by premature whitening or bleaching of wheat heads. As scabby grain contains a mycotoxin, it requires special harvest and separation procedures, as outlined here.

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Moisture Continues to Favor Development of Wheat Diseases

June 21, 2019
Surveys conducted June 16-20 in all wheat growing regions in the state showed diseases were increasing due to favorable wet conditions. There was a sharp contrast between the southeast where diseases were conspicuous and the northern Panhandle where fields looked lush green.

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Figure 1. Fusarium head blight in a state variety trial in a grower’s field in Jefferson County on June 13. (Photos by Stephen Wegulo)
Figure 1. Fusarium head blight in a state variety trial in a grower’s field in Jefferson County on June 13. (Photos by Stephen Wegulo)

Wheat Disease Update: Fusarium Head Blight

June 14, 2019
As weather conditions continue to favor the development and progression of wheat diseases, Fusarium head blight has increased from trace to moderate to high levels this week.

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Figure 1. Leaf rust, powdery mildew, and a fungal leaf spot all present in a single plot at UNL’s Havelock Research Farm near Lincoln on June 6 (Photo by Stephen Wegulo)
Figure 1. Leaf rust, powdery mildew, and a fungal leaf spot all present in a single plot at UNL’s Havelock Research Farm near Lincoln on June 6. The white tip on the head in the upper center is due to freeze injury. (Photo by Stephen Wegulo)

Wheat Update: Diseases Are Increasing

June 7, 2019
Surveys of wheat fields in southeast Nebraska during the week of June 3 revealed a significant increase in diseases from the previous week.

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Figure 1. Stripe rust in a grower’s field in Perkins County on May 30.
Figure 1. Stripe rust in a grower’s field in Perkins County on May 30. (Photos by Stephen Wegulo)

Stripe Rust Confirmed in Nebraska Wheat

May 31, 2019
Stripe rust was confirmed this week in a wheat field in Perkins County. During a two-day survey of fields in south central and southwest Nebraska, Septoria tritici blotch, tan spot, powdery mildew, and fungal leaf spots were also found at low levels.

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