Black canker disease can severely mar trees, particularly willows. Keep reading to learn how to keep your tree healthy and what to do about treating black canker on your willow tree.
What is Black Canker?
Black canker is produced by a fungus called Glomerella miyabeana. In willows, it’s frequently accompanied by a scab. Leaves that get unevenly shaped spots are an early sign that a tree could be suffering from black canker. The spots emerge in early summer or late spring. However, your tree can appear normal. Tree owners don’t even see the problem at this point, even though infested leaves can dry up.
Cankers develop at the point where, as the disease advances, you’ll see cankers where the twigs connect to branches and stems. Cankers can ultimately develop on the main trunk or stem. In the autumn, wounds leak out a pink, velvet-looking, sticky substance that has spores. The spores are moved to various tree parts and nearby trees by insects.
The natural resistance of the tree determines the size of the canker. The first year, the canker could be just an inch in diameter on resistant trees or over three inches on predominantly susceptible trees. Every year, the spaces of dead bark around the cankers get bigger. But, the disease won’t kill the tree unless many cankers come together to encircle the trunk entirely.
Black Canker Treatment
Black canker treatment includes spraying with fungicides and tree pruning. You can’t cure current cankers with fungicide. However, you might be able to stop reinfections. Treat neighboring trees too to prevent them from getting infected. Spraying should be cautiously timed. Consult a Rochester arborist for suggestions on the best time to spray for black canker on trees in your community.
Cutting away infested branches and twigs is a critical part of treating black canker disease. Your objective is to get rid of all diseased twigs and leaves. You want to be inspecting for shriveled leaves on dark-colored twigs. When black canker infects a twig, it will have a hook or droop shape at the tip.
You can attempt to treat this disease on your own. Though, to be sure that you are removing all of the infested branches, leaves, and twigs, so it doesn’t kill your other plants, it’s best to let a professional tree care company do the job for you.
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