Crabapple trees afflicted with fire blight will have leaves and newly appearing shoots that seem to be burned by fire. She is a member of the Society of Professional Journalists and has been published online at the Travel Channel and Intel. If you see bark covering wood after older bark peels away, the tree is naturally exfoliating. Diane Dilov-Schultheis has been writing professionally since 2000. Most crabapple trees infected by cedar apple rust will produce malformed fruit. This 'crabbed' appearance may have influenced its common name, 'crab apple'. Whole Seasonâ¢ crabapple is a very precocious tree that will fruit aggressively at an early age, grows 1 1/2â âHoney Crisp tastingâ apples, has good resistance to common apple tree diseases and insects, produces heavy annual crops, and is a very vigorous growing tree. Get to work diagnosing tree diseases with our pictoral summary of 10 common tree diseases. This fungal disease first affects emerging leaves in the spring, during moist conditions, and then moves to the fruit. ... such as linden, crabapple, birch, and rose. Sapsuckers girdling thin barked apple and crabapple trees with tiny holes in the bark which restrict the uptake of water and nutrition is one example. They can be susceptible to a range of pests such as the woolly aphid, diseases and disorders, but in most cases action can be taken to prevent or control the problem. Read our blog to see what dangers you avoid when you hire a tree care professional. The bark at the base of the blighted twig takes on a water-soaked appearance, then looks dark, sunken, and dry. Crabapple trees with powdery mildew disease will have a powdery white substance seen on the leaves. Bruce R. Fraedrich, PhD, Plant Pathology. Flooding can be very hard on trees and may cause some to die. Most crabapples develop a 'mottled' looking bark as they mature. Also known as CAR, cedar apple rust disease got its name because of the rusty lesions that develop on infected trees. Fruits could get darkened corky spots, if the disease is not controlled. About Apple Tree Bark Disease. Many black dots (fruiting bodies) may be seen in the cankered tissue. ... With greyish brown, flecked bark, trees can become quite gnarled and twisted, especially when exposed, and the twigs often develop spines. Most experts recommend pruning off infected fruit and limbs, as well, to stop the fungal growth from spreading to other areas of the tree. Get more pruning advice: Pruning a Crabapple Tree. Cut back and remove all of the sections of the crabapple tree disease with fire blight from the area for control of disease. If the tree retains most of its leaves and you donât mind the sparse leaf coverage in summer, doing nothing is a reasonable option. This bacterial disease can spread from flowers to twigs and branches in addition to creating cankers on the crabapple tree. You may notice small green or yellow spots on the foliage first, but these spots enlarge and darken into a rust-like color very quickly. Apple rust is often known as Juniper-hawthorn rust or cedar-apple rust and is a fungal disease of the crabapple tree. Fungicides can also be used to treat trees afflicted with powdery mildew. For instance, the crabapple variety 'Brandywine' has beautiful exfoliating bark that is natural to the tree and one of its nicest features. Identifying malus by leaves, bark, flowers, seeds,fruit and shape. Content, including images, displayed on this website is protected by copyright laws. As cooler fall weather arrives, learn how leaves change color and how your tree service can help you have more brilliant fall displays. Apple scab disease appears on the leaves in the spring and then later on the fruits of the tree.