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Black Knot
Black knot is visible as soft greenish knots or elongated swellings which form on the twigs and branches. The knots develop into black, corky, cylindrical galls that range from about one-half to 1 1/2 inches in diameter and may be more than 12 inches long. Branches beyond the gall are often stunned or dead.

Black knot is caused by a fungus that multiplies during wet spring weather. The visual symptoms are often seen six to 12 months after initial infection.

To control black knot, prune out and destroy infected twigs and branches in the fall and winter. Be sure to cut at least four inches below the visible signs of the knot. After each twig cut, be sure to sanitize your pruning tool in a mixture of one part bleach and six parts water as this helps to reduce the spread of the fungus. Large knots or cankers on main branches or the trunk should be cut out at a depth of at least one-half inch beyond the infection.
Tree with Black Knot
Tree with Black Knot
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