As reported in the June 16th Insect & Disease Report issued by MAFRD (http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-update-2015-06-16.html), stripe rust has been found in Manitoba. The first report came from a winter wheat field southwest of Killarney, followed by symptoms being found in MCVET winter wheat plots in Carman (see Figure 1). And on June 18th, stripe rust was reported in spring wheat west of Altona.
Producers are encouraged to continue scouting their winter wheat and spring wheat fields as early detection is important. The good news is wheat stripe rust can be managed by timely fungicide applications. If the disease pressure, weather conditions and crop yield potential warrant application, foliar fungicides should be applied before the disease is well-established in the crop to provide maximum benefit. There are numerous products available for the control of stripe rust; please refer to the Guide to Field Crop Protection.
If rust infections are only noticed later, especially past the flowering stage, a fungicide is likely unwarranted as the yield effect will be minimal.
For more information on stripe rust, its symptoms and control measures, visit MAFRD’s website at http://www.gov.mb.ca/agriculture/crops/plant-diseases/stripe-rust-puccina-pathway.html.
Submitted by: Pam de Rocquigny, Provincial Cereal Crops Specialist, MAFRD with information from Holly Derksen