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Disease Forecasting Models for Small Grains Available (05/26/16)

The development of wheat fungal leaf diseases (tan spot, Septoria, leaf rust) can be assessed using the NDSU Small Grain Disease Forecasting Model.

Disease Forecasting Models for Small Grains Available

Fungal Leaf Diseases of Wheat

The development of wheat fungal leaf diseases (tan spot, Septoria, leaf rust) can be assessed using the NDSU Small Grain Disease Forecasting Model. The scout-based model is best used after fungal leaf disease(s) have been detected in a field. Using the weather variables of rain, relative humidity, temperature and leaf wetness periods, the model will help predict pathogen infection periods that contribute to disease development. For example, the recent rain across some portions of ND provided a favorable environment (increase in relative humidity and leaf moisture periods) for fungal leaf pathogens (Figure 1). More detailed instructions can be found on the website: http://www.ag.ndsu.edu/cropdisease/

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Fusarium Head Blight (Scab) Forecasting Models

Small grain growers can use two models when it comes to predicting scab risk in fields. When the crop approaches heading, the scab risk model from the NDSU Small Grain Disease Forecasting Website and the model from the National Fusarium Head Blight (FHB) Prediction Center can be used to assess scab risk. Both models use environmental parameters prior to and at heading/flowering to assess risk; however, the National FHB model provides risk assessments three days in advance. Frequent scab risk updates will be provided as small grain crops approach heading.

Andrew Friskop

Extension Plant Pathology, Cereal Crops

 

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