Well, it's official. There has been some stripe rust spotted in a few winter wheat fields recently. The following "news bulletin" was sent out by OSU addressing stripe rust found at Hyslop farm.
Last year we hadn't seen any significant amount of rust until late March. I posted a short chart at that time showing the growing degree days (GDD) accumulated from the first of the year until that date near the end of March.Stripe Rust Update – January 31, 2011
On January 28, active stripe rust was found at Hyslop farm in Benton county Oregon. Stripe rust infections were found on multiple wheat lines that were planted in mid to late September. No stripe rust was found on any wheat lines that were planted in mid-October.
However, the fact that active stripe rust was found at all indicates that the pathogen survived the winter in western Oregon. If the spring environment is conducive to the pathogen, stripe rust infections could multiply quickly as in 2010. Thus, it is possible that 2011 may be a heavy stripe rust year, similar to 2010.
Western Oregon growers and crop consultants should immediately begin scouting fields for stripe rust. Early seeded fields and fields where volunteer wheat is likely (for example, 2nd, 3rd, and 4th year wheat fields) are the highest priority. Likewise, fields of Goetze are a higher priority than fields of Tubbs 06 and Madsen.
If stripe rust is found, growers and crop consultants are encouraged to apply a fungicide to control the pathogen while in its early stages. In our experience good early season control of stripe rust can be obtained by tank mixing a fungicide with your spring herbicide application (note: all fungicide and herbicide applications should be made in accordance with label directions and all applicable state and federal regulations). Stripe rust can increase 10 fold in a single generation. Thus stripe rust infections allowed to multiply can become unmanageable.
Nicole P. Anderson
Oregon State University - Field Crops Faculty
Here's a similar chart for GDD's accumulated during the month of January:
So, here we are. We'll be keeping an eye on things so talk to your CPS fieldman if you have questions or concerns.