The fungus that causes peach leaf curl overwinters on the tree. Influence of weather conditions on infection of peach fruit by Taphrina deformans. Peach Leaf Curl. 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. Share this article on social media. Phytopathology 97:1625-1633. This disease can defoliate peach and nectarine trees. 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. 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. These areas become thick and puckered causing leaves to curl and distort. Fruit is occasionally attacked. Taphrina deformans infects peaches and nectarines, also almonds and occasionally apricots and ornamental Prunus. This weakens the trees, making them more susceptible to other diseases and to winter injury. 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. In the home orchard, some registered products may be labeled for managing the disease or simply for suppression. This dis- ease is common in unsprayed orchards. Infections lead to severe distortion of the leaves soon after leaf burst in spring. Peach leaf curl is a disease caused by the fungus Taphrina deformans. During cool, wet conditions in early spring, spores from the fungus will infect the leaves when buds begin to swell . Biology Peach leaf curl occurs primarily on peach and nectarine and sometimes on apricot. Peach leaf curl is an important disease in Michigan. Share. The disease, though not a problem every spring, can be severe during cool, wet springs that follow mild winters. Symptoms: Infected leaves become thickened, curled and discoloured, and eventually dry up and drop. Peach leaf curl overwinters on buds and the bark of trees. Peach leaf curl is a fungal disease affecting primarily the leaves and shoots. Taphrina deformans. 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. 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. Infections take place in the spring as the buds open. Peach leaf curl disease shifts sugar metabolism in severely infected leaves from source to sink. Affected leaves are curled and deformed. Leaf curl is a springtime disease that occurs on peach, nectarine, and related ornamental plants. The fungus overwinters as conidia in microscopic cracks and crevices in the bark. A white powdery coating of the fungus later develops on infected leaves. Peach leaf curl is a disease of peach and nectarine, caused by the fungus Taphrina deformans. It is favoured by prolonged wet, cool weather in the spring as new growth is developing. The fungus infects peach buds from bud swell to bud opening under wet conditions. One or two well timed applications for most stone fruits should control the disease. The leaf curl fungus damages peach trees by causing an early leaf drop. What is Leaf Curl. Plant Physiology and Biochemistry 112:9-18. Rossi, V., Bolognesi, M., and Giosuè, S. 2007. Symptoms. Peach leaf curl can be managed by a single, dormant application of a registered fungicide. Young leaves develop yellow to reddish discoloration and become thickened, crisp, and crinkled. 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