I was just asked by someone about including a treatment for their Apple Trees. Any insight as to application techniques and equipment needed. I only have a backpack sprayer and would like to know what else I would need to buy in order to treat their trees. She said she had a tree company treating for Apple Scab last year but wants us to include that in the maintenance program. Also what products do you use? I am new at chemical application on trees so all info will be helpful.