2018年1月24日 · Trees in the genus Prunus, which includes plum, are susceptible to a fungal disease called black knot.Trees infected with black knot have swollen, hard, black knots on their branches. The disease is common on both wild and landscape trees and is easily diagnosed by the swollen, black galls that appear on infected branches.

2021年2月8日 · Plum trees are usually impacted at the end of the growing season, making it more resistant to the mal effects of the fungus. Source and Treatment of Plum Rust. The spores spread easily on the wind, but the fugus can be treated with fungicides. Rotate your chemicals to manage any resistant fungi. Plum Tree Diseases: Viral Plum Pox Virus

2021年7月27日 · Plum tree diseases, such as perennial canker, are spread by a fungus, infesting wood already damaged by insect, mechanical, or winter injuries. Sites with poor drainage encourage the collection of spores in damaged spots on the tree, as do excessive wounds.

2024年11月1日 · The bacteria can infect the plant through wounds. Crown gall is a bacterial disease that affects plums and other fruit trees too. Stone fruit trees are most susceptible. It’s caused by the bacterium Agrobacterium tumefaciens which is most commonly found in orchards.. The bacteria enter the plum tree through a wound caused by improper pruning, damage from tilling equipment, or boring insects.

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. Tolerant trees have many galls throughout the tree with few negative effects on the health of the ...

2021年3月1日 · Black Knot Tree Disease Info. Black knot fungus (Apiosporina morbosa) is primarily a disease of plum and cherry trees, although it can also infest other stone fruit, such as apricots and peaches, as well as ornamental Prunus species.Black knot disease spreads in spring. On rainy days, the fungus releases spores which are carried on wind currents.

2023年4月24日 · IDENTIFY black knot fungus on your cherry or plum tree (and FIX the problem) What Are the Symptoms of Black Knot? Black knot presents several telltale signs. The most obvious is easy to remember, since it has to do with the name of the disease – the black knot! An infected plant will develop large, hard, and black knots that are usually ...

The disease is most important on plum trees and, secondarily, on cherry trees. Symptoms. The disease is present only in the woody parts of trees, occurring most frequently on twigs and branches and sometimes on trunks and scaffold limbs. The warty swellings first become visible in late summer or the following spring on new shoots.

2018年3月7日 · Black knot is a widespread fungal disease that attacks plum and cherry trees, both fruiting and ornamental. The fungus, Apiosporina morbosa, (also identified as Dibotryon morbosum and Plowrightia morbsum), singles out trees of the genus prunus, which includes peach, apricot, and chokecherry.Once established, black knot is easily identified with its hard, uneven, black galls that seem to enwrap ...

A healthy tree is better equipped to resist infections. Ensure proper watering, mulching, and avoid injuring the tree. Resistant Varieties: If planting new trees, consider selecting resistant varieties or species. While no cherry or plum tree is entirely immune, some cultivars show a higher resistance to Black Knot than others.