Wheat Disease

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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Wheat exhibiting yellow streak of cephalosoprium leaf stripe
Cephalosporium stripe symptoms on wheat leaves with prominent yellow color. (Photos taken in North Platte on May 25, 2017)

Cephalosporium Leaf Stripe Developing in West Central Wheat May 25, 2017

Cephalosporium stripe, caused by a soilborne pathogen, is developing in wheat in west central Nebraska and may reduce yields if severe.

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Irrigated wheat field
Figure 1. An irrigated field in Box Butte County on May 16.

Wheat Disease Update: Wheat Streak Mosaic May 19, 2017

A survey of wheat fields in the Nebraska Panhandle found only trace levels of stripe rust and low levels of tan spot, but widespread areas of wheat streak mosaic virus with severity ranging from mild to severe.

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Wheat field near Mead, May 2017
Figure 1. State Variety Trial for wheat at the University of Nebraska Agricultural Research and Development Center near Mead on May 11.

Wheat Disease Update in Eastern Nebraska May 12, 2017

Research plots at UNL’s Agricultural Research and Development Center (ARDC) were surveyed for diseases on May 12. These plots are not sprayed with fungicide and therefore the diseases and disease levels in them can be representative of those in growers’ fields under similar conditions. Here's what we found.

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