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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 Updated May 26, 2009** **Disclaimer**
SPECIAL COMMENTARY May 26, 2009
Welcome back to the SDSU Wheat and Barley Scab Risk Advisory System for 2009
This is the first update to the scab advisory for the 2009 season. Wheat is developing rapidly in some parts of the state, and very slowly in others! While is it unlikely that any wheat is in the late boot stage or beyond, it is time to begin assessing your individual risk. Wheat (or Barley) Scab is caused by a fungus (Fusarium graminearum) that enjoys warm, wet weather. During exceptionally wet periods this fungus can cause yield and quality losses in most wheat and barley varieties. Risk factors include: prolonged wet conditions prior to heading (keeping the soil surface wet for several days to weeks); warm weather (warm days and nights are most favorable); and rainfall or very heavy dew during heading and flowering. Heavy dew being dew that lasts well into the early afternoon. Cereals planted over corn residue are at somewhat higher risk because of the high levels of inoculum present. Winter wheat often escapes major infection however, some years when growth is delayed due to over-wet soils, or weather is particulary wet through heading/flowering, scab can occur at damaging levels. Check back regularly through mid-July for further developments and updates.
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: (none at this time)
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.
Links to return to:
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: May 26, 2009
