Black knot disease (as shown in the picture), is a common disease caused by a fungus(Apiosporina morbosa). This disease is common among fruit trees, but mainly attacking plum and cherry trees. Black Knot Tree Disease Info Black knot disease is easily identified and diagnosed by its hard, uneven black galls that cocoon twigs and branches. The gall can be as little as an inch in length and as big as a foot in length. Older galls can become infested with a pinkish white mold. Black knot disease spreads in spring. On rainy days, the fungus releases spores which are carried on wind currents. If the spores happen to land on new spring growth of a susceptible tree, and especially if the tree is damp, the spores germinate and infect the tree. The disease is a slow developer and may go unnoticed a season or two. If left to grow, it effectively strangles new growth, girdling branches and dooming the tree to deterioration and poor fruit production. Insects and plant diseases use the galls as an entry to the tree. Black Knot Treatment
Pruning all branches with galls on them is a vital step when treating the disease. Because of the potential of the disease extend further into the tree, it is best to cut branches approximately 4 inches from the gall. Branches can still spread spores once they are cut so it is advised to dispose of branches appropriately. It is recommended once the branches are removed that the tree is treated with a suitable fungicide. Be sure to read and follow the instruction on the fungicide for effectiveness. The best time to remove branches with Black Knot disease is in late winter when the tree is dormant. Call Micah King at The Kings' Tree Care, (928)499-7111, for assistance in identifying, treating, and preventing black knot and other tree diseases. Follow us @treecarefortheking or checkout our Facebook page for more helpful tips! 10/24/2022 09:36:52 pm
Great information, really appreciated!!
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5/9/2023 09:56:14 pm
Black Knot Be Gone provides unique & organic products for the better black knot Fungus Treatment suitable for grape vines, apple trees, etc.
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