A: Plum trees are normally relatively sappy trees, so a little sap leaking from plum trees may not be reason for alarm. Disease often enters the tree through the damaged bark. Cytospora canker is caused by the fungus Leucostoma kunzei. A close look at the dead branches usually reveals the presence of sticky white sap in conifers. Aphids and other pests can also cause sap to drip from the branches. Disinfect your pruning shears, knife and other tools used on the infected plum trees after each use. Is it something I did wrong with my lawn care?? Remove infected branches completely from your plum tree, especially if the branches are dead from the cankers. 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. Cut out small cankers in the summer. Cytospora canker (or Valsa canker) is a very destructive peach disease that causes reduced yields and even death of trees. This fungus is often present in healthy branches. Canker in plum trees comes from an invasive fungus, which can eventually eat away at and kill your plum trees if left untreated. OSU Extension faculty and Master Gardeners reply to queries within two business days, usually less. 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. If your plum tree … The first sign of cankers is oozing light-amber gum near the infection point beginning in April or early May. Help fund crucial watchdog journalism. All Rights Reserved. You'll risk rain and water splash-back that could infect other parts of the tree or surrounding trees. Plan the perfect garden with our interactive tool →. If your plum tree is bleeding sap, it may be affected by canker, or by other forms of fungal or bacterial diseases, like pseudomonas. Place tools in a solution of one part bleach and four parts water. Though considered primarily a peach disease in New York, Valsa canker can also infect apricots, plums, prunes, and sweet and sour … Subscribe to newsletters from The Oregonian/OregonLive, including Homes & Gardens emailed to you every Friday. Dispose of any damaged branches properly to prevent spread of disease. Is this more borer damage? Bark often splits along the canker margin as the tree is defending itself and callus formation occurs. Dieback will also occur on infected twigs during the spring and early summer, with gumming at the twig’s base. There are a number of factors that may be to blame when a plum tree has sap oozing from the trunk. Likewise, don’t use a sprinkler to water infected trees. Cut away the bark and remove the infected areas using a sharp knife. Cut away the bark and remove the infected areas using a sharp knife. Q: I noticed that my Stanley plum tree in my front yard has areas where the sap oozing out has a jelly-like quality that I've not seen before. Don't remove cankers during wet, rainy weather. 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. The Cytospora canker fungus may attack many different species of hardwood trees, conifers, and shrubs. If so, how? The tree had shot hole borers a few years ago and has been losing a main branch every year or two. Then, inject a Bordeaux mixture into the plum trees to treat the cankers. 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. Investigate other fungicides if you keep farm animals near your plum trees or if your trees are located near a water source. Here are a couple publications to check out: Here and here. My thought by comparing pictures online is that it's an Umbrella Tree. Water your plum tree adequately, too. This will help to keep the trunk dry and increase air circulation around the plum tree. Don’t remove cankers during wet, rainy weather. I'm wondering two things: 1. To help avoid re-infection or spreading the infection, remove the grass and weeds from around the bottom of the plum trees. Cytospora canker disease generally attacks spruces, especially Colorado blue and Norway varieties, as well as peach trees, Douglas firs or hemlock trees. Likewise, don't use a sprinkler to water infected trees. Is there something I can use or do to stop them? Prevention is just as important as treatment when one of your plum trees has canker. A sunken canker forms on branches and is often coated in a thick layer of resin. What’s yours? What is cytospora canker? Trees often ooze sap at a spot injured by lawn and garden equipment. Learn which plants thrive in your Hardiness Zone with our new interactive map! However, if you notice your plum tree is bleeding sap, your tree may have a problem that should be solved as soon as possible. Also, postpone your dormant pruning until January or February. Apply a wound dressing to the excised canker wounds. Many times, however, the discoloration is not evident because the fungus killed the bark rapidly. Remove infected branches completely from your plum tree, especially if the branches are dead from the cankers. It produces tasty plums but the leaves weren't looking so good toward the end of summer. – 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. Canker in plum trees comes from an invasive fungus, which can eventually eat away at and kill your plum trees if left untreated. Yuck. A: Worms breathe through their skin and when heavy, heavy rains hit (like has happened here lately), they need to come out of the ground to breathe. 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). 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. Borers can affect healthy trees, but they are more common on trees that are weakened by drought, sunscald or injury. 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. Sarah Terry brings over 10 years of experience writing novels, business-to-business newsletters and a plethora of how-to articles. Q: My walkways, patio and driveway are being invaded with worms! this … 2. – Benton County. A Bordeaux mixture is a combination of copper sulphate and hydrated lime that is effective at killing fungi. 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. Cytosporaspecies cause branch dieback and cankers on trees or shrubs. Cut at least four inches below the canker, and try to keep the margins as smooth as possible. It is occurring at what looks like cracks in the bark. Please help me identify what type of plant this is. 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. Hot, dry conditions in summer or sunscald in winter can stress the tree and may be the cause for a plum tree oozing sap. 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. Burn the infected wood or throw it in the trash. I moved here four years ago but this is the first year of this invasion. Some pests may require chemical control. The fungus may quickly girdle and kill twigs without formi… Community Rules apply to all content you upload or otherwise submit to this site. Disease begins when the tree becomes stressed by insect feeding, snow or ice damage, drought or other factors. Once you determine the problem, the solution may involve improved maintenance, environmental modifications or other non-chemical approaches. Prevention is just as important as treatment when one of your plum trees has canker. Wipe the tools down and dry them immediately to avoid corrosion. Cankers on stems and branches are often elongate, slightly sunken, discolored areas in the bark. Can this be pruned successfully? Take special care when using a Bordeaux mixture, because the copper in the mixture can harm fish, livestock and earthworms in your soil. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Local. Several types of borers, like peach tree borers, can infect plum trees. This illustrated tutorial may help you determine how you want to prune it. 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. You can cut it back to almost any point, just making sure to cut above a growth node on the stem. Borers are easy to distinguish from disease because the sap is mixed with frass (the debris and fecal matter left behind by boring insects). To prevent mechanical damage, be careful when using mowers, weed trimmers, or other lawn equipment.