apple scab

[Carwax36]

My crabtree has had apple scab for many years> I have sprayed it
twice in the past two weeks with Home Orchard Spray by Bonide. Is it
possible to cure this disease?

 

[John Paul Sanborn]

There is only control for this pest. On my course I use a combination of Banner Max and generic 3336, this gives me up to 5 weeks of protection. Whatever used, coating the entire leaf, top and bottom is needed. Spray to drench, but not so waste product if flowing on the ground, mind your drift.....

The fungus over winters on deadwood and leaf debris, os sanitation will help. Pruning to thin for better air flow through the canopy will help.