It infects Norway maple (including all of the horticultural forms such as "Crimson King"), Silver maple and Freeman's maple. One of the most common types of fungal problems is called anthracnose; strains of anthracnose infections usually cause irregularly shaped spots or blotches on trees' leaves, according to the University of Missouri Extension. The first set of leaves with the black spots is most probably botrytis which is a fungal disease. Brown spots appearing on maple tree leaves or on the leaves of box elder trees are typically caused by something known as tar spot. When the problem is severe, it may cause the leaves to fall off and can lead to a tree that is virtually empty of foliage. A number of issues can cause a pear to develop black spots, and a weak, unhealthy pear tree is less likely to put out a healthy crop of fruit. Black spots appear on the leaves , placed on the spaces between the nerves. Homeowners with maple trees are calling the Michigan State University Extension Lawn and Garden Hotline concerned about numerous spots appearing on the leaves… It is a maple and it is tar spot, a common fungal infection Leaf spot diseases should be taken seriously if they result in moderate to complete leaf loss two to … … The following are some of the more probable causes: Hot Weather and Drought – During times of drought, trees are more susceptible to being damaged by radical changes in temperature. # Many types of fungi cause leaf spots, and the powdery mildew gives the appearance of a white coating on the leaves of the Weeping Willow. Citrus black spot is a fungal disease caused by Guignardia citricarpa. A combination of black canker and willow scab is known as willow blight. The disease is These spots are surrounded by chlorotic margins and limited by the veins. A heavy insect infestation will cause all of a plant's leaves to be coated with honeydew. African Pegmatite is the supplier of copper oxychloride Demildex as an effective treatment and prevention measure against black … Photos of affected leaves would help, if you're not sure. As the disease progresses, the spots dry up and leaves can shed, leading to defoliation. Greasy spot develops as spores from the fungus Mycosphaerella citri germinate and colonize on the underside of Meyer lemon tree leaves. Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis. T Strict regulation and … Leaf spots multiply at the end of the growing season. Tar spot is a fungal disease that manifests itself as black spots on the leaves of infected trees. Leaf miners, another insect, will cause brown spots to appear on your leaves. Pecan scab is an extremely serious disease of these trees. The fungus appears as yellow, dark brown, or black lesions that initially occur on the underside of mature citrus leaves. There are three different, but related fungi. Our maple (or is it an oak) tree seems to be suffering. Anthracnose is a fungal disease which can come on very quickly, usually during periods of long … The brown spots on the second picture looks like damage from sawflies (slugs) or pear psylla (black slugs). Resistant Varieties Although there are some variety differences in susceptibility to Fabraea leaf spot, generally just consider the fact all European pear varieties are susceptible … The presence of black spots on the leaves of a pear tree indicates a problem. Look for bags hanging in the tree where the insect matures. The leaves may have dark speckles on the top or underside. When you touch them they feel just like a leaf with no bumps, sticky, fungus, just black spots. Both will do great damage to your tree and your … In the early stages, water-soaked, light spots appear on infected fruits. Shrubs by interrupting photosynthesis season and has little impact on the leaves holly! 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