How to Control White Leaf Spots on Cruciferous Vegetables
Cercospora /Pseudocercosporella While the fungiCercosporaorPseudocercosporellathat make ashen spot can severely affect turnip , rutabaga , canola , leaf mustard , radish , horseradish root , and hybrids of turnip and mustard , they are much less likely to affect kale , collards , Brassica oleracea italica , or cauliflower . This is a cool conditions disease and is most potential to strike at 55 to 65 F. The disease has been a particular problem on canola flora in Europe with pod losses of up to 15 % ....