Wheat Disease June 19, 2015
![Field of wheat with severe Fusarium (head scab)](documents/Fusarium-head-blight-6-15-F1.jpg)
![Wheat field of Fusarium Head Blight (Scab)](documents/Fusarium-head-blight-6-15-F2.jpg)
Wheat Disease Update: Scab in Eastern Nebraska
![Diseased wheat fields in eastern Nebraska](documents/Fusarium-head-blight-6-15-F3.jpg)
![Diseased wheat heads in eastern Nebraska field](documents/Fusarium-head-blight-6-15-F4.jpg)
(R) Figure 4. Close-up of two wheat heads in a grower's field in Saline County on June 18 showing 100% (left) and 80% disease severity.
![Rust in oats](documents/Crown%20rust%20in%20oats%20June%202015.jpg)
![Stem rust in oats](documents/Stem%20rust%20in%20oats.jpg)
Other diseases observed on small grain cereal crops during the survey were crown rust on oats (Figure 5), stem rust on wheat, barley, and oats (Figure 6), and bacterial streak on wheat. These diseases were observed in fields at Havelock Farm in Lincoln.
In southern Nebraska, stripe rust development has mostly stopped because diseased leaves in fields with susceptible varieties that were not sprayed are dead and the rust has no more healthy tissue to infect. In the northern areas, especially in the Panhandle, stripe rust may still be active in some fields. Warm to hot weather in the coming days should considerably slow stripe rust development.Some common foliar diseases of wheat such as Septoria tritici blotch are not prominent in many fields this season because stripe rust killed the leaves before these diseases developed to noticeable levels.
Management
It is too late in the growing season to spray wheat fields to control fungal diseases. In the next issue of CropWatch, we will present strategies for harvesting and handling Fusarium head blight and vomitoxin (DON)-affected wheat grain.
Stephen WeguloExtension Plant Pathologist
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![A field of corn.](https://casnr.unl.edu/styles/unl_hero_large/public/images/hero/agronomy.jpg)