Late-season Rust Observed in Eastern Nebraska Wheat; Limited Yield Impact Expected

June 20, 2025

Late-season Rust Observed in Eastern Nebraska Wheat; Limited Yield Impact Expected

Wheat Disease Update for June 20, 2025

By Stephen Wegulo - Extension Plant Pathologist, Samantha Daniel - Extension Educator, Katherine Frels - Assistant Professor, Department of Agronomy and Horticulture, Kyle Broderick - Extension Educator and Coordinator of the UNL Plant and Pest Diagnostic Clinic

maturing wheat field with yellowing heads

Figure 1. A wheat state variety trial at the hard dough growth stage at ENREEC on June 19.

Stephen Wegulo | Nebraska Extension

On June 19, wheat disease surveys were conducted in Gage, Lancaster and Saunders counties.  Growth stage ranged from hard dough at the Eastern Nebraska Research, Extension and Education Center (ENREEC) near Mead in Saunders County (Figure 1) to mature and drying down in readiness for harvest in Gage County (Figure 2). 

 

golden wheat field
Figure 2. A dried down grower’s wheat field in Gage County on June 19. (Stephen Wegulo | Nebraska Extension)

 

Diseases observed at Havelock Research Farm (Lancaster County) and ENREEC were leaf rust at moderate to high levels (Figure 3), stripe rust at advanced stages of development (Figure 4) and Fusarium head blight at moderate levels (Figure 5). 

 

wheat leaf with yellowish orange spots
Figure 3. Leaf rust in research plots at ENREEC on June 19. (Stephen Wegulo | Nebraska Extension)
wheat leaf covered in black spots
Figure 4. Stripe rust at an advanced stage of development (telial stage) in research plots at ENREEC on June 19. (Stephen Wegulo | Nebraska Extension)

 

As of June 19, leaf rust has been confirmed in two additional counties, bringing the total number of counties with confirmed leaf rust to three (Figure 6). The number of counties with confirmed stripe rust remains at 14 (Figure 7). Both diseases arrived late in the wheat growing season and are not expected to cause significant yield loss except in a few isolated hot spots.

 

bleached wheat head turning white
Figure 5. Fusarium head blight in research plots at ENREEC on June 19. (Stephen Wegulo | Nebraska Extension)
map of Nebraska with counties affected by stripe rust highlighted in orage
Figure 6. Nebraska county map showing the distribution of leaf rust as of June 19. (Stephen Wegulo | Nebraska Extension)
nebraska map with stripe rust infected counties highlighted in orange
Figure 7. Nebraska county map showing the distribution of stripe rust as of June 19. (Stephen Wegulo | Nebraska Extension)

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