What is wrong with my peach tree?
Peach leaf curl is a fungal disease that causes defoliation and fruit loss when the weather during bud swell and opening is cool and wet. No fungicides will control the disease after the buds open. It is too late to control now.
Next spring apply a fungicide such as liquid lime sulfur (organic) before buds begin to swell. Thorough coverage of all bark and bud surfaces is important.
See more on our website http://extension.umd.edu/growit/diseases-stone-fruit