Scab Epidemic Risk Model

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Plant Pathologist Commentary: 08/03/2011

Damages due to scab are becoming more visible with every day that passes. There are reports of field severities as high as 40% in commercial fields. In the inoculated screening nurseries and fungicide evaluation trial at the Northwest Research & Outreach Center, field severities of 80% and higher are not uncommon. It appears that 2011 will go into the books as a scabby year, with damage levels not seen since 2005.

As Marcia McMullen stated in an e-mail earlier today, growers will need to turn their attention now to harvest strategies. This includes drying the crop down as quickly as possible, harvesting the most damaged fields or areas of a field separately, and turning up the wind speed on the combine to blow out the lighter fraction of kernels. The later will increase harvest losses, but removal of the visually scabby kernels as best as possible is a must as the percentage scabby kernels correlates very well with the DON concentration on the grain.

Have a safe harvest!

This commentary will be probably be updated once more on 08/10/2011.

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.