I have a Spring Snow Crab Apple Tree. Last 2 years I have had it sprayed for...
I have a Spring Snow Crab Apple Tree. Last 2 years I have had it sprayed for Apple Scab. My Aborist told me that once the tree has flowered it is to late to treat Apple Scab. What do you think?
Dakota County Minnesota
Your arborist is correct it is too late to prevent the disease. However, it doesn't hurt to spray the tree throughout the summer to lessen the defoliation. Here is an article on the disease: https://extension.umn.edu/plant-diseases/apple-scab
I have a Radiant Crab that is very prone to Apple Scab and I spray it all summer long to keep the leaves. It will be bad this year because we were having our deck redone and I couldn't spray because there would be fungicide on the deck.