In 2016 the milder winter conditions resulted in early leaf and stripe rust infections in Tennessee and Kentucky. This resulted in rust spores being blown into Ontario earlier than we typically see. By mid-May 2016, stripe rust was prevalent in most areas of southwestern Ontario.
Growers who selected tolerant varieties or applied a foliar fungicide were able to keep the disease at bay. However, growers that selected susceptible varieties and did not apply a foliar fungicide saw significant yield reductions where the disease was present.
In 2017, stripe rust again arrived early in southwestern Ontario and was found in one field in Essex County the first week of May. Although we have not historically seen stripe rust at significant levels in Ontario in the past, it is important to have a plan in place in 2018 for managing this disease. For the full story, click here.