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IPM Survey – Wheat and Sunflower Disease Summary of 2015 (09/10/15)

There were several diseases detected in wheat and sunflower this year. Some diseases were found consistently throughout the state, while other diseases were more localized to a particular region. Regardless, the timely information obtained by the scouts is critical in updating growers and agricultural professionals throughout the state. Below is a summary of the disease data from the 2015 growing season for wheat and sunflowers.

IPM Survey – Wheat and Sunflower Disease Summary of 2015

There were several diseases detected in wheat and sunflower this year. Some diseases were found consistently throughout the state, while other diseases were more localized to a particular region. Regardless, the timely information obtained by the scouts is critical in updating growers and agricultural professionals throughout the state. Below is a summary of the disease data from the 2015 growing season for wheat and sunflowers.

Wheat

Foliar Diseases

Tan spot was the most common disease reported this year and was frequently observed when the wheat crop was tillering to flag leaf emergence (Figure 1). Severity was generally low across the state and the highest levels of tan spot pressure were observed in wheat on wheat ground. This can be expected as the tan spot pathogen overwinters on wheat residue. Stripe rust was observed sporadically during the early stages of crop development, but incidence levels increased as the crop approached flowering (Figure 2). The highest levels of stripe rust were found on the eastern half of the state (100% incidence in some fields), and the lowest levels were found in the western half of the state.

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Head Diseases

Fusarium head blight (scab) was documented in 37% of the wheat fields when the crop was in milk to early dough development (Figure 3). Although scab levels were generally low within fields, higher levels of scab were found in northcentral ND. Ergot was frequently detected in southwest ND with several fields having incidence levels above 10% (Figure 4).

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Sunflower

Downy mildew of sunflower was observed sporadically across the state this year. The disease was found in 74 out of the 237 fields visited by the scouts (Figure 5). Incidence levels within a field varied from 1% to more than 50%.

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Sam Markell

Extension Plant Pathologist, Broad-leaf Crops

 

Andrew Friskop

Extension Plant Pathology, Cereal Crops

 

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