Today's Date: 2018-06-20

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Scab Epidemic Risk Model 

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Plant Pathologist Commentary: Small Grains Disease Update 07/06/2017

Growth stages are ranging from Zadocks Growth stage 50 - 80 (inflorescence emergence to early dough development) across the state state. The warmer temperatures around the July 4th holiday, combined with rain events have seen growth stages advanced rapidly. With higher temperatures fields which are close to flowering will start to flower quickly and for those that have still to apply fungicide for Fusarium head blight control, fields should be watched closely so as not to miss the optimal spray timing at early flowering. Flowering in warm temperatures will be shorter, the period lasting 3-4 days. If no anthers are visible, open up spikelets to check for either green immature anthers, or if the plant has already flowered, embryonic grain development, which will be visible roughly four days after flowering.

What's Out There?

This past week Leaf rust has been spotted again in field in Nicollet and Le Sueur County, but as previously reported these incidences are low and disease severity is low.

Tan spot and Septoria spot blotch are the other two diseases being more widely reported. Applications being made for Fusarium head blight control will also help control these diseases in the later part of the season.

Overall, despite some early tan spot and powdery mildew, disease levels are looking pretty good across the state. Fusarium head blight control is the main concern at this time in the season.

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.