Answer: You may be overwatering your tree! Most trees and shrubs require one-inch of water per week, applied slowly so it trickles down and wets the entire rootmass. Browning leaves can be a sign of water stress, or of a disease called apple scab. If the fruits are misshapen and the leaves of your tree develop olive-green blotches and then turn brown, I'd suspect scab. To avoid scab problems, your apple trees can be sprayed with Bordeaux (lime-sulfur). This fungicide must be applied early and thoroughly to protect new growth. Apply according to label directions; as the buds break until the leaves are fully expanded. Do this at prepink, pink, calyx, and first cover. Since the fungus overwinters in fallen leaves and fruit, be sure to thoroughly clean up and dispose of plant debris in the fall months.
Good luck with your tree!
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