The disease is most under the slow drying conditions prevalent during cool, rainy weather . Warm weather during early spring suppresses disease development. The grey white coating on infected leaves represent millions of fungal spores known as conidia. These spores are blown to areas on the tree where they will survive the upcoming winter. Leaf curl is controlled by copper sulfate, fixed copper, chlorothalonil, or ziram, applied with dormant sprays .
Sprays are most effective applied after leaf fall or in early spring.
Online References Steiner, P.W., and Biggs, A.R. 1997. Peach leaf curl, Taphrina deformans. West Viriginia University Kearneysville Web Site. Smith, T.J. 1998. Peach leaf curl.