Stephen Wegulo - Extension Plant Pathologist

Stephen Wegulo

faculty
Work Plant Sciences Hall (PLSH) 406H
Lincoln NE 68583-0722
US
Work 402-472-8735 On campus, dial 2-8735

Faculty Bio
Website: Wheat Disease section of CropWatch Plant Disease Management
Twitter: @wegulo2

Wheat leaf rust
Wheat leaf rust

Wheat Disease Update June 10, 2016

A survey of wheat research plots in east central Nebraska found a variety of diseases, including severe rust on wheat and barley.

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Wheat stripe rust
Figure 1. A flag leaf completely covered with stripe rust in a grower’s field in Nuckolls County on May 25.

Stripe Rust Increasing; Spray Your Wheat to Protect the Flag Leaf June 2, 2016

Stripe rust has significantly increased in all wheat-growing areas in Nebraska. It is recommended that wheat be treated with a fungicide to protect the flag leaf. If the incidence (percentage of flag leaves diseased) or severity (percentage of the flag leaf area diseased) is less than 50%, spraying a fungicide will significantly reduce yield loss due to stripe rust.

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Severe stripe rust in wheat
Severe stripe rust in wheat

Wheat Disease Update - Late May May 26, 2016

A survey of wheat fields in southeast and south central Nebraska this week found most fields looking healthy with little or no disease. Fungal and virus diseases were found at varying levels in some fields. Depending on growth stage and disease present, fungicides may still be beneficial.

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Barley yellow dwarf disease in wheat
Barley yellow dwarf disease in wheat

Head Diseases, Barley Yellow Dwarf in Wheat May 19, 2016

With wheat headed or flowering in southeast and south central Nebraska, head diseases are starting to appear, including Fusarium head blight, loose smut, white mold (scab) and barley yellow dwarf. Wheat stem maggots were also causing damage.

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Leaf rust in wheat at the UNL Havelock Farm
Leaf rust in wheat at the UNL Havelock Farm

Wheat Disease Update May 13, 2016

Wheat is heading, headed, or flowering in most fields in eastern Nebraska. The Fusarium Head Blight Prediction Center is currently showing a low risk for scab in Nebraska. However, due to the recent rains, there is a possibility that some level of scab may occur in some fields, and the risk will be higher in areas that receive rainfall in the next 10 days. Base the decision to apply a fungicide to suppress scab on the risk level, the cost of application, and the price of wheat.

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Wheat stripe rust
Stripe rust in wheat

Stripe Rust Widespread in Wheat But Mostly At Low Levels May 6, 2016

Report of this week's wheat disease survey: On May 3 stripe rust was observed for the first time at the UNL Havelock Farm in Lincoln, where incidence was low and severity ranged from trace to high. t the Agricultural Research and Development Center near Mead on May 3, infections had spread from small hot spots one to two weeks earlier to larger areas in research plots, and leaf damage was apparent Wheat growth stage at these two locations ranged from flag leaf emergence to heading. On May 5, field surveys found stripe rust to be widespread in the west central and southern Panhandle of Nebraska. The flag leaf had not emerged or was just starting to emerge in these parts of the state. Wheat mosaic virus was identified in Deuel County.

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Wheat field in Saline County April 28, 2016
Figure 1. A healthy-looking wheat field in Saline County on April 28. Recent rains boosted wheat growth, but created conditions favorable for wheat disease. Growers are encouraged to scout and treat if necessary to protect the flag leaf. (Photos by Stephen Wegulo)

Conditions Favorable to Disease Growth in Wheat April 29, 2016

Wheat field surveys in southeast and south central Nebraska (Lancaster, Saunders, Saline, Filmore, Thayer, Nuckolls, Webster, and Clay counties) on April 27-28 found little disease in growers’ fields.  The wheat crop looked healthy and was growing vigorously (Figure 1) thanks to the recent rains.

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stripe rust on wheat
Figure 2. Stripe rust on the upper leaves in a research plot at the ARDC on April 21

After Rains, Some Wheat Diseases Increasing April 22, 2016

Following rains across much of the state last week, wheat diseases appear to be increasing, based on field surveys this week. Reported diseases include powdery mildew, stripe rust, and leaf spot.

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