Slightly raised, black spots deform the fruits. Rake up and discard any fallen... BEFORE INFECTION. In the spring, the fungus in the leaves produces spores and releases them into the air. To reduce the number of available overwintering spores present, apply a 5% solution of urea (46-0-0) in water to apple trees as leaves begin to fall in the autumn to aid in the breakdown of leaf tissue (42 lb urea in 100 gal. Apples and crabapples are valuable and beloved for their fruit and spring flowering, and keeping them healthy is important. All that a fungicide does is create a protective coating so that the spores that land on the leaves or fruit cannot become active, thereby breaking the disease cycle on the tree. Apple … Successful control of apple scab combines orchard monitoring and disease forecasting systems in an integrated approach using cultural control to minimise fungicide inputs … Your best bet to prevent apple scab is to choose one of the disease-resistant varieties. Using the wrong type of spray can injure or kill pollinators, which are important parts of our ecosystem. This is especially important with apples, crab apples and pears. If apple scab is present, do not throw those leaves in the compost but dispose of them in the garbage. Don protective clothing, such as long sleeves, gloves and a breathing mask. Apple scab is a significant problem in the climate of the Pacific Northwest. HOW DO I TREAT APPLE SCAB? Infected leaves that are left under the tree are sources of disease for the following growing season. The destruction of leaf litter in the fall by flail mowing or through the application of chemicals that hasten leaf litter degrading, such as urea, helps reduce primary inoculum. Trees infected with apple scab are unsightly but the damage is more far-reaching. Management of apple scab is focused on the prevention of primary infection by ascospores. You'll see the first sign of … However, not all apple scab fungi are the same. Generally, you’ll first notice it in early spring, when rains, wind, and cool temperatures spread the fungal spores. The Apple Scab fungus overwinters on fallen leaves. Shredding leaves.Shredding all leaves on the orchard floor in November or April reduces the number of scab spores by about 85%. Pruning, Cabling & Bracing info@independenttree.com. The immature fruit might also drop. Regardless of the scab management program used in an orchard, we recommend reducing apple leaf litter and the scab inoculum it contains. The fungus thrives in areas with lots of rain and high humidity, and during a warm, wet spring. If the infection occurs just before harvest, these symptoms will only show when the apples are stored, hence the term “storage scab”. Fungicide applications are therefore timed to coincide with the spring release of ascospores (between bud break and petal fall). Pest & Disease Protection Apple Scab Disease. If you have your mind set on a variety that is susceptible to apple scab, plant a dwarf or semi-dwarf tree, which will allow you to apply a preventative fungicide on the entire tree (more about that below). Apple Scab. Timing is key. Leaves will eventually fall to the ground, the tree weakens and fruit and leaves develop olive green spots, then cracks. It is also the responsible thing to do, as chances are that if you have apple trees your neighbors will also have apple trees. Since apple scab spreads so easily, treating your trees is an important way to keep it in check and to prevent infecting your neighbor’s trees as well. Do not use an all-purpose fruit tree spray when your apple trees are blooming. Many species, cultivars, and varieties of Malus are resistant to the scab fungus. Protecting trees during this period of incredibly rapid development is an essential first step to preventing an apple scab epidemic. 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