Peach leaf curl disease shifts sugar metabolism in severely infected leaves from source to sink. Infections lead to severe distortion of the leaves soon after leaf burst in spring. Phytopathology 97:1625-1633. Probably the most common peach tree fungus is Taphrina deformans, which causes peach tree leaf curl, sometimes referred to simply as leaf curl.This frustrating disease stunts the tree’s growth and severely hampers fruit production. It is favoured by prolonged wet, cool weather in the spring as new growth is developing. In order for the leaves to become infected, there needs to be at least 12 hours of moisture (high humidity or rain) and temperatures between 50° and 70°F. Peach leaf curl overwinters on buds and the bark of trees. Symptoms: Infected leaves become thickened, curled and discoloured, and eventually dry up and drop. Infections take place in the spring as the buds open. Influence of weather conditions on infection of peach fruit by Taphrina deformans. The fungus infects peach buds from bud swell to bud opening under wet conditions. For a list of specific products that may registered to manage peach leaf curl in the home garden in New York please see our fruit fungicide table. Peach leaf curl is a disease of peach and nectarine, caused by the fungus Taphrina deformans. Taphrina deformans. Taphrina deformans infects peaches and nectarines, also almonds and occasionally apricots and ornamental Prunus. During cool, wet conditions in early spring, spores from the fungus will infect the leaves when buds begin to swell . These areas become thick and puckered causing leaves to curl and distort. The fungus that causes peach leaf curl overwinters on the tree. Peach leaf curl is a common disease on peach and nectarine trees throughout the Midwest and eastern U.S. Where the disease is severe, tree vigor and fruit quality and yield are diminished. Share this article on social media. Peach Leaf Curl Cornell University Cooperative Extension Nassau County Peach Leaf Curl Peach leaf curl is a springtime disease of peach, nectarine, al- mond and related orna- mental species caused by the fungus Taphrina deformans. What is Leaf Curl. Peach leaf curl is a fungal disease affecting primarily the leaves and shoots. This dis- ease is common in unsprayed orchards. In the home orchard, some registered products may be labeled for managing the disease or simply for suppression. Fruit is occasionally attacked. One or two well timed applications for most stone fruits should control the disease. Biology Peach leaf curl occurs primarily on peach and nectarine and sometimes on apricot. Young leaves develop yellow to reddish discoloration and become thickened, crisp, and crinkled. The disease, though not a problem every spring, can be severe during cool, wet springs that follow mild winters. A fungal disease that affects peaches and nectarines, leaf curl (Taphrina deformans) is one of the most common disease problems found in backyard orchards.Symptoms appears in spring as reddish areas on developing leaves. Plant Physiology and Biochemistry 112:9-18. Affected leaves are curled and deformed. The leaf curl fungus damages peach trees by causing an early leaf drop. This weakens the trees, making them more susceptible to other diseases and to winter injury. Leaf Curl is a fungal disease which overwinters in the crevices of the tree bark and around the buds. Symptoms. The fungus overwinters as conidia in microscopic cracks and crevices in the bark. When the buds start to swell, conidia are washed between the loose bud scales where they come in contact with developing leaves and start to infect them. Rossi, V., Bolognesi, M., and Giosuè, S. 2007. Peach Leaf Curl. Peach leaf curl is an important disease in Michigan. This disease can defoliate peach and nectarine trees. 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