|
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 May 31, 2008*** **Disclaimer**
SPECIAL COMMENTARY (May 31, 2008)
Welcome to the 2008 SDSU Wheat and Barley Scab Risk Advisory.
This is the first posting to the advisory for 2008, and we might be a day or so behind for some producers. A few changes this year...we are obviously covering the whole state in 2008, instead of just East River counties, and just in the nick of time too. Above average precip. over the past week, and forecasted rain for the next 48-72 hours in southwestern and south-central SD means that these areas are elevated to the high or moderate risk levels. Rains over the past week in southeastern SD as well as a couple of central SD counties means that these areas too have elevated risk levels.
Just a refresher..."elevated risk" means that areas have had weather conditions favorable for spore (inoculum) development. If your area is highlighted and your wheat is flowering (or is headed and near flowering) you may be at greater risk of scab infection.
Scab infection is favored by temperatures between about 55 and 90F along with high humidity or free moisture (dew or rainfall). Cooler temps require longer wet periods, and help reduce risk of infection.
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: May 31, 2008
