Canada: Tackling fungicide resistant pink rot

Ridomil has been the standard fungicide for managing pink rot for many years in Canada. However, a national survey shows Ridomil-resistant pink rot is becoming more common. A team of researchers with Agriculture and Agri-Food Canada (AAFC) in Charlottetown, Prince Edward Island conduced a three-year national pink rot survey and to evaluate other fungicides for managing resistant pink rot. According to research lead Rick Peters, much more resistance was found in Eastern Canada versus Western Canada. “But the fact that we are starting to see resistance in the west for the first time is also a concern. Pink rot resistance is certainly something to keep on everyone’s radar”, he says. The scientists researched alternative fungicides and according to Peters, “we found that phosphites were the most effective products, but only when they were applied foliarly through the growing season. These products are very systemic and have the capacity to move down into the tubers to provide protection in the field. Also those tubers still have some of that protection as they move into storage.”  More