Three important diseases of willows in the UK are anthracnose, scab and black canker. They harm the trees and can make them unsightly. Common relatives of the willowscab fungus (i.e., Venturia spp.) cause leaf and shoot blight diseases on woody-plants including apple (Malus spp.), pear (Pyrus spp.), or poplar (Populus spp.). The scabs, recognizable by the browned or blackened foliage they cause in infected trees, are fungus diseases. In the case of willowscab, a fungus is the cause: Venturia saliciperda. Willowscab is a fungal disease that causes leaf symptoms, followed by brown spore masses at the base of leaves. The symptoms of scab on willow start with dark spots on the leaves. The diseases are Black Stem canker caused by Glomerella miyabeana, Willowscab caused by Venturia saliciperda, and Leaf spot caused by Pseudocercospora salicina. : a disease of willow trees caused by a fungus (Fusicladium saliciperdum) and characterized by rapid killing of leaves and canker and dieback of young shoots. called also willow blight. Willow Tree Care, Pruning & Disease Prevention The majestic, graceful willow tree is often found by a pond, stream or other body of water. Early signs of willowscab include masses of olive green spores along the veins of the underside of leaves. Willowscab often occurs with black canker on willow trees. The term willow blight is often used in reference to simultaneous infections. These diseases cause defoliation and twig dieback that can lead to tree death. Black canker and scab occur... Willowscabdisease, also referred to as twig blight, is a fungal infection caused by the pathogens Venturia saliciperda and Glomerella miyabeana, according to the Bartlett website. Various diseases can affect the weeping willow. Willowscab, which is a fungus, kills young leaves and produces green spores on the underside of foliage. Scab and black canker are two diseases of willow (Salix spp.) associated with rapid blighting of leaves and shoots as well as dark brown to black stem cankers. In some years Willowscab and Black canker cause serious damage to the leaves, shoots and young branches of several willow species. The diseases often occur together on the same tree...
