Apply a wound dressing to the excised canker wounds. Place tools in a solution of one part bleach and four parts water. Hot, dry conditions in summer or sunscald in winter can stress the tree and may be the cause for a plum tree oozing sap. Cytosporaspecies cause branch dieback and cankers on trees or shrubs. – Benton County. A sunken canker forms on branches and is often coated in a thick layer of resin. Here are a couple publications to check out: Here and here. Community Rules apply to all content you upload or otherwise submit to this site. – Chris Rusch, OSU Master Gardener, Q: This plant is at least 30 years old, in too small of a pot (the pot will have to be broken to get it out), and stands almost 10 feet tall. Cut at least four inches below the canker, and try to keep the margins as smooth as possible. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Learn which plants thrive in your Hardiness Zone with our new interactive map! – Signe Danler, OSU Extension Master Gardener. Cut away the bark and remove the infected areas using a sharp knife. All Rights Reserved. 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. Canker in plum trees comes from an invasive fungus, which can eventually eat away at and kill your plum trees if left untreated. Disease often enters the tree through the damaged bark. The Cytospora canker fungus may attack many different species of hardwood trees, conifers, and shrubs. 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. Aphids and other pests can also cause sap to drip from the branches. If so, how? Some pests may require chemical control. © 2020 Advance Local Media LLC. Yuck. Cut out small cankers in the summer. 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. Don’t remove cankers during wet, rainy weather. It is a destructive disease caused by the fungus Leucostoma kunzei that disfigures and can even kill vulnerable trees. – Ann Kinkley, OSU Extension Master Gardener. Borers are easy to distinguish from disease because the sap is mixed with frass (the debris and fecal matter left behind by boring insects). Burn the infected wood or throw it in the trash. Is there something I can use or do to stop them? Help fund crucial watchdog journalism. Dieback will also occur on infected twigs during the spring and early summer, with gumming at the twig’s base. You can sweep them back into the yard and they will be happy to go back into the soil if it is not too wet. The fungus may quickly girdle and kill twigs without formi… This fungus is often present in healthy branches. Other names for the disease are blossom blast, spur blight, twig blight, and gummosis. Cankers occurring on large scaffold branches, in the main crotches, or on the trunk may enlarge to girdle and kill the portion of the tree above that point. Don't remove cankers during wet, rainy weather. A Bordeaux mixture is a combination of copper sulphate and hydrated lime that is effective at killing fungi. However, if you notice your plum tree is bleeding sap, your tree may have a problem that should be solved as soon as possible. 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. All rights reserved (About Us). The canker forms from a small necrotic center that slowly enlarges with the collapse of the inner bark tissue. It is occurring at what looks like cracks in the bark. Cankers can develop on the large branches or even the trunk and enlarge to the point where they’ll choke off and kill the part of the tree above them. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Local. Can this be pruned successfully? Older cankers therefore are oval to elongated in outline. The tree had shot hole borers a few years ago and has been losing a main branch every year or two. OSU Extension faculty and Master Gardeners reply to queries within two business days, usually less. 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. Bark often splits along the canker margin as the tree is defending itself and callus formation occurs. Please help me identify what type of plant this is. Cytospora canker is caused by the fungus Leucostoma kunzei. It may take several years for the canker to girdle the branch. A: Plum trees are normally relatively sappy trees, so a little sap leaking from plum trees may not be reason for alarm. Many times, however, the discoloration is not evident because the fungus killed the bark rapidly. Borers can affect healthy trees, but they are more common on trees that are weakened by drought, sunscald or injury. Cytospora canker disease generally attacks spruces, especially Colorado blue and Norway varieties, as well as peach trees, Douglas firs or hemlock trees. 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. Kym Pokorny | For The Oregonian/OregonLive, Subscribe to newsletters from The Oregonian/OregonLive. Is this more borer damage? This will help to keep the trunk dry and increase air circulation around the plum tree. You’ll risk rain and water splash-back that could infect other parts of the tree or surrounding trees. Bacterial canker of plum is actually a disease that can affect any tree from the Prunus genus. Trees often ooze sap at a spot injured by lawn and garden equipment. The fungus attacks the woody parts of stone fruit trees through bark injuries, pruning cuts, dead shoots, and buds. Investigate other fungicides if you keep farm animals near your plum trees or if your trees are located near a water source. Winter is here and yet we’re still getting plenty of gardening questions to Ask an Expert, an online question-and-answer tool from Oregon State University’s Extension Service. The fungus grows so fast on stressed trees that there is no evidence of a sunken canker. There are a number of factors that may be to blame when a plum tree has sap oozing from the trunk. Prevention is just as important as treatment when one of your plum trees has canker. 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