Like all plants however things can go wrong and this page is designed to help you identify what the problem is and the best method of dealing with it. It is usually selected for its abundant and stunning display of pink flowers and lush reddish-purple leaves. Dormant oil sprays can be effective for controlling scale. Knowing the signs and disease cycle helps you identify, treat, manage and prevent it. Viral Diseases. The disease is transmitted by aphids and grafting. Tree fungus identification includes not only taking a good look at the fungus, but also taking a look at the surrounding habitat. Control of aphids is important for management. Many viruses may infect ornamental plum trees. Black Knot Tree Disease Info. It is particularly showy because flowers bloom early in the spring before foliage appears. grow in U.S. Department of Agriculture plant hardiness zones 2 through … Plum Tree Disease & Insects. Prunus ringspot virus is the most prolific, attacking nearly all plum species. Black knot disease spreads in spring. Plum Tree Care and Diseases Plum Tree Care, Pruning & Disease Prevention. Scale is a pathogen with minute, circular, scales with yellow dots which can appear on branches, twigs, and fruit. It causes cankers that first appear on limbs as reddish-brown discolouration in the bark; starting out small, these cankers can get up to 50 centimetres in length along the infected limb, cracking the bark and killing it. Depending on the species, plum trees (Prunus spp.) 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. The growth of fungi is intricately linked to its surroundings. Black knot is a fungus that infects plum and cherry trees. This fungus gets into plum and apple trees through wounds in bark caused by insects, natural stressors, and/or improper pruning. Plum trees are one of the more resilient fruit trees and if they are given good care then they will most likely remain unaffected by pests and diseases. Plum pox virus is a serious and often fatal disease of plum trees. If it doesn’t find an ideal growing conditions, it won’t be able to grow. The purple-leaved plum tree is a dramatic ornamental tree.

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