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The most obvious sign of black knot is the hard, black, swollen galls, commonly called knots, on branches and twigs. Black knot also infects fruit spurs, and sometimes trunks. Infected trees may produce few flowers or fruit.
Black knot is a common fungal disease of Prunus trees including ornamental, edible, and native plum and cherry trees. Hard swollen black galls (tumor like growths) form on branches and occasionally on trunks. Many Prunus trees tolerate black knot.
appearance of affected landscape trees. Black knot appears to be a minor problem on Prunus spp. found in forest situations, where susceptible trees are surrounded by many non-susceptible species of trees. Black Knot is mainly a problem in North America (Canada, the United States and Mexico) where it is indigenous. A record from 1979 indicated
Black Knot is a fungal disease predominantly affecting trees from the Prunus genus, including plums, cherries or apricots, and other stone fruits. It’s known for its distinct black, swollen galls or knots that appear on branches and stems.
Caused by a fungus (Apiosporina morbosa), black knot is a common disease that affects many types of fruit trees, but mainly wild and cultivated plum and cherry trees. It creates knobby dark growths on the trunk and branches that may eventually lead to the tree’s death.
Black knot is a disease that is most severe on cultivated crops in orchard and ornamental planting situations. Black knot appears to be a minor problem on Prunus species found in forest situations, where susceptible trees are surrounded by many nonsusceptible species of trees.
28 Φεβ 2023 · Black knot is a fungal disease, caused by Apiosporina morbosa, that attacks stonefruit species in the genus Prunus. Black knot is known for irregular, thick, black swellings on limbs. Severe infestations can reduce production drastically, reducing infected trees to a worthless condition in a few years if the disease is not addressed.
