What’s wrong with these kale leaves?
These leaves are infected with Sclerotinia sclerotiorum, the causal fungus of white mold. White mold is showing up in brassica fields now in South Carolina. Initial development is initiated when cold weather triggers sclerotia (hard, black survival structures found in the soil) to produce tiny mushrooms that release spores. The spores infect collards, kale, cabbage, broccoli, etc. and develop leaf spots with grey discoloration and white fungal growth, like the one in the photo. These lesions may also develop on developing cabbage and broccoli heads. The stems may be attacked as well, which may lead to the death of the plant. Plant Pathologist Tony Keinath wrote a recent article with some management tips that can be found here.
This week’s question is from Justin Ballew, Extension Fruit and Vegetable Research Associate.
The South Carolina Grower 