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 field
Figure 1. A grower’s wheat field in Webster County on May 30.

Wheat Diseases Minimal June 8, 2018

Diseases continue to be absent or at very low levels in Nebraska wheat, with no reports of stripe rust or leaf rust and low levels of powdery mildew. Prevailing high temperatures and dry conditions in many areas have reduced the risk of significant disease development.

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May 30 Nebraska Extension Wheat Field Day in Jefferson County
Figure 1. Attendees viewed more than 30 wheat variety trials at this Nebraska Extension Winter Wheat Field Day northeast of Fairbury May 30. Ten more wheat field days will be held this June. (Photos by Stephen Wegulo)

Wheat Disease Update — Levels Still Low May 31, 2018

Wheat fields in southeast and south central Nebraska were green with little disease and high yield potential, based on this week's field survey. Recent rains relieved moisture stress in wheat in some areas of the state, but more rain is needed in southeast Nebraska to alleviate stress.

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Wheat field in Saline County at heading
Figure 1. A wheat field in Saline County at the heading growth stage with no diseases on May 23. (Photos by Stephen Wegulo)

Wheat Disease Update: Southeast Nebraska May 24, 2018

A survey of wheat in southeast Nebraska found diseases generally absent or at very low levels, mainly due to recent dry conditions. Continued scouting for foliar diseases is recommended, especially in areas that receive rainfall and where the wheat crop has not yet headed.

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Wheat field 5/17/18
Figure 1. A healthy-looking wheat field in Box Butte County in the northern Panhandle on May 17. (Photos by Stephen Wegulo)

Wheat Disease Update May 18, 2018

A survey of wheat fields in central, southwest, and Panhandle regions of Nebraska found little disease. In addition recent rains have helped alleviate moisture stress.

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Wheat field exhibiting symptoms of sulfur deficiency.
Figure 1. Areas of yellow wheat on slopes in a field in Nuckolls County on April 27, 2010, typical of sulfur deficiency.

Addendum to May 11 Wheat Disease Update May 14, 2018

To differentiate sulfur deficiency from nitrogen deficiency in wheat, look for field patterns. Symptoms of yellowing limited to certain areas is more typical of sulfur deficiency. In addition, symptoms of sulfur deficiency are more conspicuous when soil temperatures are cold as in early spring.

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Healthy field of wheat
Figure 1. A disease-free irrigated wheat field in Nuckolls County on May 9. (Photos by Stephen Wegulo)

Wheat Disease Update May 11, 2018

No diseases were found during a survey of wheat fields in south central and southeast Nebraska this week, but growers are urged to continue scouting as recent rains may create conditions favorable to disease development.

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A typical wheat field in Nebraska early in the growing season.
Figure 1. A typical wheat field in Nebraska early in the growing season.

It's Time to Scout for Wheat Diseases April 19, 2018

With the predicted return to more normal temperatures, it's time to get into wheat fields and start scouting. Stripe rust has already been reported in southeastern Kansas and is expected to move northward. Included is a table of fungicide efficacy ratings for disease management in wheat.

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Stripe rust ina field of wheat

Wheat Disease Update: Wheat Streak Mosaic and Stripe Rust January 8, 2018

From the 2018 Crop Production Clinic Proceedings, this wheat disease update focuses on wheat streak mosaic virus and stripe rust.

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