Today's Date: 2014-04-17

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Scab Epidemic Risk Model 

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Plant Pathologist Commentary: Small Grains Disease Update 07/19/2013

The grain fill is rapidly progressing towards physiological maturity in both spring and winter wheat across the State. Actually, the first winter wheat in West Central Minnesota was reportedly harvested today. The scouts continue to predominantly fin the tanspot/Septoria complex of leaf diseases and BYDV. Incidence of leaf rust remains low while no stem or stripe rust was found to date.

This year marks the 20th anniversary of the great scab epidemic of 1993 and. Although we have made considerable progress towards controlling the disease, by now means have we eradicated or silenced the disease. Winter wheat trials in LeCenter and Crookston are showing a fair amount of FHB as do the some of the earliest spring wheat fields. It is too early to tell whether we have widespread problems this growing season but that the disease is here again this year is pretty clear.

Therefore, assess the damage caused by FHB now and prepare for harvest accordingly. If you have little to no affected spikelets 10 to 14 days after anthesis you escaped the worst and can probably harvest the way you always do. If, however, you see 10% more of the spikelets affected, you need to make sure that you: 1) increase the fan speed to attempt to remove as much of the tombstone kernels as possible, 2) store the harvested grain separately as much as possible. The idea is to reduce the DON toxin levels as much as possible in the harvested grain and quarantine grain that may have elevated levels of DON as to not contaminate otherwise sound grain from other fields/varieties.

Bruce Potter in Lamberton reported on flights of armyworm moths a few weeks back. Doug Holen confirmed armyworm damage in lodged grain earlier today in the Fergus Falls area that included leaf and head clipping. Armyworms are dark green to light brown worms that can get up to 1.5

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.