According to Oregon State University, some of the best apple scab fungicide options include Bonide Captan, summer lime sulfur, Spectracide Immunox and wettable sulfur. ), mountain ash (Sorbus spp. Trees infected with apple scab are unsightly but the damage is more far-reaching. Leaf tissue is necessary for the spores to survive and orchards are self-infecting since spores can travel about 100 feet. If apple scab is present, do not throw those leaves in the compost but dispose of them in the garbage. Pear scab symptoms affect young growth, leaves and fruit. This fungus has several strains that are host-specific, according to the University of Minnesota Extension. Nadia Hassani has nearly two decades of gardening experience. Not all apple cultivars are equally susceptible to the fungus, and numerous disease-resistant apple varieties have been bred. Apple Scab. Apple Scab can be treated with: Propizol® Fungicide (Crabapples only) or PHOSPHO-jet. In some cases, using a fungicide to treat apple scab may be necessary. If temperatures are cooler, the wetting period must be longer for infection to occur. Apple scab is the most economically important disease of apple in the world. Apple scab symptoms on fruits are similar to those on their leaves. However, not all apple scab fungi are the same. When spring arrives, the fungi release their spores, which are carried by wind to fresh leaves, twigs, fruit and flowers. Fungicides against apple scab can only protect healthy trees from getting infected, they do not get rid of the fungus on an infected tree. The disease is caused by the fungus Venturia Inaequalis. GENERAL PREVENTION MEASURES. Plantain leaves have anti-inflammatory properties and are very effective in treating … along with Cotoneaster (Cotoneaster spp. The apple scab fungus needs moisture on the leaves to start a new infection. The fungus thrives in areas with lots of rain and high humidity, and during a warm, wet spring. Proper sanitation is key to prevent the spread of the fungus. Also mow around the tree once leaves have fallen to speed their breakdown. The spots of scab may look sunken or velvety. Make applications when the trees are in full leaf and actively growing for control of the next season’s leaf disease development. Pear Scab Symptoms. Proper sanitation is key to prevent the spread of the fungus. Thoroughly remove fallen leaves, not only in the fall, but also during the growing season. Rebekah Pierce is a freelance writer in upstate New York. This is especially important with apples, crab apples and pears. Apple Scab is one of the most common diseases that attack apple trees. Once the tree shows symptoms of the disease during the growing season, spraying a fungicide won’t have any effect. Spraying an infected tree with a fungicide is only an option if the tree has lost most of its leaves for three or more consecutive years. Another way to treat apple scab is to rake and destroy the fallen infected leaves. Apple scab remains dormant in fallen leaves and on fruit left attached on the tree and lying ground. In the spring, the fungus in the leaves produces spores and releases them into the air. It overwinters on fallen leaves and fruit, and because it also affects wild-growing hawthorne, crab apple, and mountain ash trees as-well-as shrubs like pyracantha and cotoneaster, it’s hard to protect your trees against infection from other plants in the local area. For example, the strain that affects mountain ash will affect only mountain ash and not apple trees. Fruits also may drop prematurely from the tree. Prune Rid Of Apple Scab. Apples in southwest Michigan are at tight cluster and at 0.5-inch green tip on the Ridge. This disease can impact the fruit and leaves of your trees and cause serious losses. Another way to treat apple scab is to rake and destroy the fallen infected leaves. 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