Ensuring sufficient water (1 inch per week) will support the tree through the stress of disease and leaf regrowth. While the disease is not typically a threat to the health of an established tree, smart cultural practices can reduce the risk of serious damage to the tree and prevent further spread of the disease. As the tree leaves mature over the season, they become more tolerant to infection. Severely affected leaves may be shed and replaced by a new set. Infections caused by anthracnose usually affect the lower branches and branches in the interior of the tree before progressing upwards. Photo by Rebecca Finneran, MSU Extension. Leaves severely affected by anthracnose may be shed. The lesions grow between veins and on leaf margins. Leaves of infected trees have dark, irregularly shaped damaged areas, or lesions, composed of dead tissue. Symptoms appear in years with cool, wet weather that supports fungal growth. These fungi overwinter in fallen leaf tissue and infected buds. Several different fungi can cause the symptoms we describe as anthracnose. Both anthracnose and maple leaf blister can be the cause of late spring and early summer damage to leaves of these popular landscape trees.Īnthracnose is a common spring disease on maple trees common in the landscape including red ( Acer rubrum), silver ( Acer saccharinum), sugar ( Acer saccharum) and Japanese ( Acer palmatum) maples. Each year, Michigan State University Extension receives questions from the public regarding spots on the leaves of their favorite maple trees.
0 kommentar(er)
