Anthracnose is a very common disease that can attack a very wide range of plants and trees. There are two ways Anthracnose disease can attack trees: 1) Spot Anthracnose that impacts tree leaves and blossoms, and; 2) the more harmful canker version which disrupts and can destroy a tree’s vascular system.
If a tree is infected with Anthracnose over several seasons, the fungal disease can begin to infect twigs and branches. Once the tree’s vascular system becomes infected with Anthracnose, the tree’s bark will begin to show symptoms. Dark colored lesions or indents can begin to show on branches and twigs. Cankers can develop and branches show dieback. As the tree is stressed, it is common to see small saplings begin to sprout from the base of the tree’s trunk.
When a tree’s vascular system is infected with Anthracnose, immediate steps need to be taken to arrest the disease spread. In the early spring, at the time of bud break, spray the tree with Fruit Tree, Vegetable & Ornamental Fungicide, 1 Pint Concentrate. Continue spraying the tree with the fungicide every week until the leaves are fully developed. Once the leaves are fully developed spray the tree every 3 to 4 weeks until the end of the season. To enhance the effectiveness of the Fruit Tree, Vegetable and Ornamental Fungicide, mix the spray with Nature’s Own Helper spray additive.
If the tree is too tall to spray, treat with Agri-Fos with Pentra Bark.
In addition to treating the tree with the appropriate fungicide, prune and destroy dead and severely diseased branches. Be sure to prune during dry weather and sanitize the pruning tools after each cut with a mixture of 1 part bleach and 4 parts water.