Today's Date: 2017-06-26

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Scab Epidemic Risk Model 

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Plant Pathologist Commentary: Small Grains Disease Update 06/19/2017

In many areas applications are now being made for late season leaf disease, and Fusarium head blight.

What's Out There?

Leaf rust has been found with low severity and about 20% incidence in Nicollet, La Sueur, and Grant Counties. Rust are also starting to appear in trials at the Northwest Research and Outreach Center. Septoria spot blotch is now beginning to be visible in many fields. Areas with high humidity will continue to see these diseases progress over the next week. Areas which have suffered hail damage may be at risk from Bacterial leaf streak (BLS). However, symptoms will not be obvious for several weeks. Remember that spraying fungicide for BLS is not effective as it is a bacterial disease. In considering FHB control, check if the variety is a moderately resistant or susceptible variety (check the variety trials guide). Risk should then be checked using the FHB forecasting tool. Caramba and Prosaro are some of the best products to control FHB and mycotoxin levels. However, with low risk and a moderately resistant variety, tebuconazole containing products (e.g. Folicur) can also be considered. Application should be made at early flowering (GS Feekes 10.5.1). However, if this window is missed, spraying 5-7 days post flowering can also have some efficacy and is more efficacious than spraying before flowering begins.Watch pre-harvest intervals on products if making later applications. DO NOT use products that contain strobilurins for control of FHB as they may elevate DON levels.

Important Note Important Note: Please review Terms of Use before utilizing this site. This Fusarium Head Blight (FHB, or 'scab') model is a pre-flowering model. It is meant to be applied using weather conditions during the week leading up to flowering. Therefore, the epidemic risk for a particular field should be determined by selecting a time coinciding with or just prior to the initiation of flowering in that field. A growth stage estimator is available on this website, but you should still monitor growth in your own fields to better estimate the date on which flowering begins.