My red maple tree needs help. If you are certain that you have a difficult to treat fungal disease and the tree is in a position that you value its appearance, replacing the tree with a resistant cultivar is worth considering. Sunken, watery lesions form on the surface, and red-skinned apples begin to fade in color. The white rot fungus infects an apple tree’s wood and fruit, but not the leaves. Spray the tree with a fungicide as the tree starts to bud. It's possible to treat apple tree diseases on your own, and we provide expert advice later in this article on how to treat specific diseases. Apples begin to develop a soft rot, unlike bitter rot and black rot, which form firm rots. Apple scab is a fungal disease that affects both edible and ornamental apple tree varieties. Cedar apple rust (Gymnosporangium juniperi-virginianae) is a fungal disease that requires juniper plants to complete its complicated two year life-cycle.Spores overwinter as a reddish-brown gall on young twigs of various juniper species. Apple scab spreads rapidly between 55-75 degrees F. Treatment. They can be controlled by fungicides or other physical measures. To help your apple trees recover from cedar apple rust and to improve their condition, M&M Tree Care also recommends applying organic fertilizer. While this disease affects several plant genera, including Sorbus, Cotoneaster, and Pyrus, it is most commonly associated with the infection of Malus trees, including species of flowering crabapple, as well as cultivated apple. Fungi that infects trees in the rose family can also infect roses, and lead to garden disease. You can kill tree fungus by dousing the affected area with a solution of Clorox bleach and water. The fungus is a vigorous saprophyte and may colonize the dead tissue of many other hosts. If realized from the beginning, you can take preventive measures early on to keep the disease from plant apples and apples. This can help reduce the severity of apple scab in a tree. However, its parasitic activities are confined mainly to pome fruits. The disease may occur in three forms: a fruit rot, leaf spot, and limb canker on apple trees, and a fruit rot on pear and quince. Apple fruits are one of the most widely cultivated fruits in the world, are round (pome) in shape and range in color from green to red. PEST AND DISEASES AFFECTING APPLE TREE BRANCHES AND TRUNK BARK CRACKED, PATCHES OF BARK SUNKEN DOWN Canker is a fungal infection which enters tree wood at the site of existing damage, normally caused by bad pruning techniques although damage by woolly aphid (see above) can also allow the fungus to enter the tree. When treating apple tree fungus becomes a necessity, you have a few choices. Apple Scab. Apple tree owners everywhere should read on to learn about controlling apple scab in their trees. In some cases, prophylactic treatments can slow the fungus enough for the tree's natural defenses to take over and kill the fungus. Photo by Mike Quinn. But trees including plants that are susceptible to various diseases. The fungus spores are released in the spring during wet weather and are blown by the wind onto vulnerable, newly emerging leaves. I have recently purchased a house that has two mature fruit trees in the backyard, a plum and an apple. Apple canker is a disease caused by a fungus, Neonectria ditissima, which attacks the bark of apples and some other trees, causing a sunken area of dead bark and, eventually, death of the branch.New cankers form from mid-spring, and once formed are present all year. 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