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The Risk Map below applies to cereals in the most susceptible stages for infection.
For wheat that occurs at flowering (Feekes 10.51).
For barley flowering occurs around head emergence
Check the map below to see the predicted risk for your area of South Dakota.
This map indicates relative risk for scab based on weather data analyzed over the past 7 days and the forecasted weather for up to 3 days .
***Map Last Updated July 15, 2008*** **Disclaimer**
SPECIAL COMMENTARY July 15, 2008
Due to the dry conditions recently experienced in SD, along with the advanced crop stage in SW, we have passed out of the time of risk for FHB. This will be the last regular update to the forecast.
In summary, the scab situation in SD for 2008 is as follows: areas of WW production in the state were at medium to high risk for scab during the critical time of flowering, and it is expected that some scab will be reported from these areas. But because of the high level of fungicide use at heading, and the relatively cool conditions, severity is expected to be low on average. Those with untreated, susceptible varieties which were headed or flowering around the first two weeks of June may expect to see levels as high as around 10% disease, but those cases should be rare.
For SW areas, risk has been moderate to low for most of the state, with dry conditions extending through the late flowering and milk stages, setting up a situation where disease impact at harvest should be very low (undetectable, or <1%). Some very early planted fields may have experienced some time of elevated risk, and may contain detectable levels of scab in the field, however severity should remain low there as well.
Of course, local conditions may have influenced your fields differently, and your final disease levels may differ accordingly.
As of today, scab has been observed on some samples in our diagnostic clinic, as well as in the fields around the state, but incidence has been very low.
For additional information, go to www.wheatscab.psu.edu - our partner forecasting site.
Click on a date below to view archived risk advisories from earlier in the season:
May 31, 2008 Archived Advisory
June 4, 2008 Archived Advisory
June 9, 2008 Archived Advisory
June 11, 2008 Archived Advisory
June 16, 2008 Archived Advisory
June 23, 2008 Archived Advisory
June 26, 2008 Archived Advisory
June 30, 2008 Archived Advisory
July 3, 2008 Archived Advisory
July 7, 2008 Archived Advisory
Legend for Map Colors:
Red High Risk Info Yellow Info Blue Info White Unknown Info
DISCLAIMER:This website and the risk advisory service contained within are offered free of charge to the public. The advisory was developed to provide wheat and barley growers with information to help them make more informed decisions about disease management. It is not intended that the advisory be used solely to schedule fungicide treatment, rather it is intended to aid growers and crop managers in that decision process. Understanding the relationship of weather/enviroment to scab development is one of the keys to implementing sound management strategies. The advisory is only a tool to illustrate the relative risk for scab development. The models used to develop the risk advisory are experimental. Any management decisions made based on the information contained herein are strictly the responsibility of the person or persons making such decisions. No warranty or guarantee is expressed or implied.
SDSU Extension Plant Pathology Homepage
College of Agriculture & Biological Sciences
SDSU Plant Science Department
This page is maintained by the SDSU Extension Plant Pathology Project, Dr. Lawrence Osborne, Extension Plant Pathologist and Project Leader, SDSU Plant Science Department. ph (605) 688-5543.
Comments or Questions? Please feel free to email: Lawrence Osborne
Last modified: July 15, 2008
