Submitted by: Holly Derksen, MAFRI Field Crops Pathologist
Leaf rust in winter wheat was observed in the MCVET trials in Carman and Winnipeg over the last week (see image below). This is the first report of cereal rust in Manitoba this year and it has not been reported in commercial fields. Pustules were observed mostly on lower leaves and at low severity. The MCVET trials do not receive any fungicide applications.
Due to its late arrival this year, cereal rusts will not have an impact on yield as most crops in the province are further advanced. The latest a fungicide ever needs to be applied in wheat is at the FHB timing ie. full head emergence to early anthesis.
Taken from the Manitoba Insect and Disease Update for the Week of July 22, 2013: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-report-2013-07-23.html