How to Treat Curly Leaf on Peach Trees. Taphrina deformans infects peaches and nectarines, also almonds and occasionally apricots and ornamental Prunus . May is the month when diseases start to come out full force. To be sure, check the roots for rusty-red or brown discoloration in spring, before the plant is due to fruit. Peach potato aphids can damage plants in two ways, either directly by piercing the leaf with their feeding tubes and sucking the sap, or indirectly by infecting the plant with a virus. Mar 8, 2020 - Explore Leroy Haddock's board "Peach tree diseases" on Pinterest. Gardening Australia presenters answer commonly asked gardening questions. Peach leaf curl is a disease caused by the fungus Taphrina deformans. Infections lead to severe distortion of the leaves soon after leaf burst in spring. Powdery Mildew. The fungus can kill the peach tree or infect the fruit with blemishes or rotting. The crown gall infection, which is caused by the Agrobacterium tumefaciens bacteria, produces corky tumors in the plant tissue. These areas become thick and puckered causing leaves to curl and distort. During cool, wet spring weather, the spores infect new leaves as … Peach trees can grow up to 8 m (19 ft) in height and produce fruit for 10 to 20 years. This disease affects both the fruit and leaves of the tree. The fungus eventually causes the leaves to yellow and fall. Common hosts include peach, nectarine, prune, plum, and apricot. The disease affects fruit, leaves, and twigs. Many of the most serious peach tree diseases are caused by funguses and bacteria. Click on photos to enlarge Symptoms when viewed close-up. The first symptoms appear in the early summer. Potato leafroll virus (PLRV) is a member of the genus Polerovirus and family Luteoviridae.The phloem limited positive sense RNA virus infects potatoes and other members of the family Solanaceae. Purplish-red spots with a white area in the center show up on the surface of leaves at the beginning of the infection. This fungal disease attacks the leaves of the tree, causing them to curl and crinkle inward from the outer edge. The other two bacterial plum tree diseases, bacterial spot and shot-hole, are caused by the Xanthomonas pruni and Pseudomonas syringae bacteria. The affected leaves detach from the tree.So, it will produce the defoliation of the tree. Disease twigs should be cut back to a healthy bud and the prunings should be burned. My Garden Path - Angela Moles . The trees are generally free from disease but occasionally suffer from Coral Spot (dead twigs become covered in pink pustules). Leaf curl, brown rot, blossom blight and peach scab are among the most common fungal diseases that affect the peach tree. Figs Pest, Diseases & Disorders. An infestation by white peach scale can result in stunting, leaf … This year, the disease that seems to be frustrating folks the most, both for growers and homeowners, is peach leaf curl. Growths or discolorations on peach tree leaves often indicate a disease -- usually a fungal infection. Pecan tree stems, buds and leaves coated in white powder are suffering from a powdery mildew outbreak. Symptoms of peach leaf curl. While many of the problems caused by bacteria, fungi, molds, and viruses can be treated when symptoms are observed, some of the most serious strawberry plant diseases cannot be treated after the plants are in the ground. The peach leaf curl disease causes the leaves to curl, turn red and pucker, according to the University of Georgia Cooperative Extension article, "Home Garden: Peaches & Nectarines." This is a common fungal disease that affects peaches and nectarines. With time the spots grow and cover the whole leaf. 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