Prevention is just as important as treatment when one of your plum trees has canker. Cut out small cankers in the summer. All Rights Reserved. OSU Extension faculty and Master Gardeners reply to queries within two business days, usually less. This will help to keep the trunk dry and increase air circulation around the plum tree. Can this be pruned successfully? Remove infected branches completely from your plum tree, especially if the branches are dead from the cankers. The first sign of cankers is oozing light-amber gum near the infection point beginning in April or early May. The fungus grows so fast on stressed trees that there is no evidence of a sunken canker. It produces tasty plums but the leaves weren't looking so good toward the end of summer. If so, how? I moved here four years ago but this is the first year of this invasion. I'm wondering two things: 1. Diagnose canker in your plum trees by inspecting them for holes in the outer bark and rust-colored ruptures on the trees. Preventing the spread of canker is essential in not only saving the infected tree, but also preserving the health of surrounding plum and other fruit trees. What is cytospora canker? A: Plum trees are normally relatively sappy trees, so a little sap leaking from plum trees may not be reason for alarm. However, if you notice your plum tree is bleeding sap, your tree may have a problem that should be solved as soon as possible. Prevent further infection, do your summer pruning after harvest so that the weather is dry. Some yard products are lethal to worms and you will find them squirming on the surface of the soil if they have been poisoned, but I presume that is not what has happened at this time of the year. Community Rules apply to all content you upload or otherwise submit to this site. Cytospora canker is caused by the fungus Leucostoma kunzei. Disease begins when the tree becomes stressed by insect feeding, snow or ice damage, drought or other factors. © 2020 Advance Local Media LLC. Terry has written articles and publications for a wide range of markets and subject matters, including Medicine & Health, Eli Financial, Dartnell Publications and Eli Journals. Don’t remove cankers during wet, rainy weather. Here are some questions asked by other gardeners. To prevent mechanical damage, be careful when using mowers, weed trimmers, or other lawn equipment. Kym Pokorny | For The Oregonian/OregonLive, Subscribe to newsletters from The Oregonian/OregonLive. Dieback will also occur on infected twigs during the spring and early summer, with gumming at the twig’s base. Cut at least four inches below the canker, and try to keep the margins as smooth as possible. Cytospora canker disease generally attacks spruces, especially Colorado blue and Norway varieties, as well as peach trees, Douglas firs or hemlock trees. Yes, you can prune it – in fact they take very well to pruning, and this is a great way to keep it to manageable size. What’s yours? Cytospora canker is a type of common fungal disease that often affects trees weakened by drought, severe weather, or injury caused by improper pruning or a lawnmower blade. Once you determine the problem, the solution may involve improved maintenance, environmental modifications or other non-chemical approaches. Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/20). If you have poor drainage in your yard it would be a reoccurring event, but since this is the first time it has happened in four years, my best bet would be that they are simply flooded out due to the recent downpour. Signs and symptoms of Cytospora canker Trees infected with the Cytospora canker fungus typically show scattered branch dieback, often starting on the lower branches or where trunk cankers are formed. – Ann Kinkley, OSU Extension Master Gardener. If your plum tree is bleeding sap, it may be affected by canker, or by other forms of fungal or bacterial diseases, like pseudomonas. Wipe the tools down and dry them immediately to avoid corrosion. Aphids and other pests can also cause sap to drip from the branches.

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