A small area (less than 2’ wide) of stripe rust was found on May 30 in a wheat field in Polk County in southeast Nebraska. The field was at flowering and severity levels on affected leaves ranged from low to about 35%.
Photo Source: University of Nebraska
Since then, stripe rust has been observed in south central Nebraska and in the Panhandle. Dry conditions in the southern states this year considerably slowed development of rust diseases, despite the near perfect conditions for rust diseases. Cool temperatures and wet weather since April had many growers on alert.
For wheat fields that are flowering or past the flowering growth stage, the impact of stripe rust on yield is likely to be minimal. Producers should scout for stripe rust on these fields in case a fungicide treatment is needed.
For younger wheat fields, producers are encouraged to scout fields. If stripe rust is spotted and the wheat is fully headed out but not yest flowering or younger, be prepared to apply a fungicide listed for rust. (Click here for University of Nebraska-Lincoln’s fungicide table
If the wheat crop is at the early flowering stage, apply a fungicide that has good efficacy agains Fusarium head blight or scab. Such a fungicide will also effectively control or provide protection against rust dieases. When applying any fungicide, be aware of the preharvest interval.
For More Information
Ready this University of Nebraska article: Update on Stripe Rust in Nebraska