Cankers enlarge and progressively encircle infested areas, killing those who live beyond them. Weeping willow is vulnerable, whereas black willow is rarely affected. Remove and destroy any dead or canker pieces. Spray with a fixed copper fungicide that has been approved by the manufacturer. Do not use sulfur because it harms other plants in your garden.
Willow trees are very susceptible to infection by several species of fungi. The most common cause of disease on willow trees is Phytophthora megakarya, also known as corky bark disease. Other species of fungi that can infect willow trees include Poria placenta, Armillaria ostoyae, and Cylindrocladium sp. Willow bark disease is usually found in warm climates with hot, dry seasons. It can also be caused by exposure to rain when the bark is wet. The spores of the fungus can be blown by wind from one infected tree to another or into the soil where they can germinate and grow into more trees or colonies.
If you find diseased willow trees during spring cleanup time, call a tree service company to come remove them. Don't try to take them down yourself because they can be dangerous if they're still alive.
Willow trees are native to Europe and Asia but are now cultivated in many parts of the world for their wood, which is used for furniture making, pallets, and toys.
Willow Tree Blight Control Applying a fungicide to the tree, particularly the leaves, is the best approach to deal with this. Another option is to cut the affected branches while the tree is dormant in late fall or early winter, which will assist to slow the development of the illness. A third option is to see if a local wildlife organization can help out. They may be able to relocate the tree to a new location where it can grow healthily.
Pruning and fungicide spraying are used to cure black canker. Fungicide cannot be used to treat existing cankers, but it may be used to prevent reinfections. To keep surrounding trees from being infected, treat them as well. Spraying should be done with great caution. If an insect is seen near the tree, don't spray. Wait for a few days before spraying again in case the insect has moved away.
Black canker is a fungus-related disease that affects many species of willows, killing the shoots that rise up through the bark and creating dead areas under the willow tree. The best defense against black canker is to remove infected willow shoots before they turn brown and die. This will prevent further infection of healthy willow shoots by removing a source of food for the fungus. Cankers can be treated with sulfur sprays or antibiotics if necessary. Avoid applying these treatments to healthy tissue because they can harm other parts of the plant.
Black canker causes serious damage to willow plantations because the disease spreads quickly using wind-blown spores. There is no control measure other than removal of infected willow. Infected branches should be cut off at least 15 inches from the trunk to avoid spreading the disease. Do not burn infected willow because smoke contains germs that can enter the air and infect other plants or animals. A tree surgeon can remove diseased willow without damaging other trees if this problem arises in your yard.
However, some insects may cause problems for weeping willows, so keep an eye out for symptoms of infestation.
Several pests may attack weeping willows, including the gypsy moth, aphids, and borers. These insects are tough to control, especially on huge trees, although focused spraying can aid in their control. Young weeping willows are extremely appealing to deer, elk, and rabbits; use a collar to keep animals away from young trees. If you do not want animals eating your flowers or fruit, install motion-activated lights around your yard.
Weeping willow trees have thick bark that is easy to see when damaged. The white fluffy balls underneath the bark are actually insect eggs. The tree's soft green leaves turn yellow in fall before they drop off. That is when you will notice the larvae feeding on the roots until spring when more trees bloom with more larvae feeding on the seeds.
If you find bug eggs on your tree, this does not mean it will eventually become infested with larvae. Bugs often lay their eggs in healthy plants to start new populations. It is best to remove any buggy plants you find so they do not spread disease to other parts of the garden. Use a hand shovel to dig up weeds and root vegetables that are infected with worms. Do not wash these items before cooking them or else you will spread the infection.
Insects and diseases can and do cause great damage to weeping willow trees.
Bacterial canker is often treated mechanically, with affected branches cut using sterile pruning tools. If feasible, wait until late winter to cauterize the wound with a hand-held propane torch to prevent reinfection by bacterial canker. This should be done only by someone who is trained in using a torch and knows how to avoid startign a fire.
Canker is also treated chemically. The best option for trees in urban areas is to have a woodlot manager or other qualified person administer a systemic bactericide such as copper. Do not use pesticides or herbicides around cankers or other tree diseases; this will only cause more damage.
Treatments for canker include: Drench trees with copper sulfate solution (do not apply if soil is peaty or acidic). This should be done when soils are not frozen and/or water is available to trees in at least monthly periods during the treatment year. Apply at rate of 1 gallon per 100 feet of tree height. Rotate treatments sites so that trees do not become resistant to this approach. Use of this method is limited by cost and availability of trained personnel.
Burn trees when they are diseased. This may be done as part of natural forest processes or by skilled professionals. It is important to limit burn severity. Avoid burning understory plants that provide food for wildlife.
Apply glyphosate on a freshly cut stump using a paintbrush. Repeat as directed by the manufacturer to ensure that the herbicide penetrates the stump and roots. This method eliminates the need for a stump grinder and has a higher success rate in reaching and eliminating the willow's extensive root structure.
Stumps can be difficult to remove because they are thick, hard, and stable. The best way to remove them is with mechanical equipment such as a stump grinder or tractor-mounted stump puller. These tools break down the wood into manageable pieces which can then be removed using other methods. If you do not have access to these types of machines, there are other options available for removing stumps.
The first step in removing a stump is to determine how large the stump is going to be after it is removed. This will help you select the right tool for the job. Large stumps may require a backhoe or other heavy machinery. Smaller stumps can be removed using hand tools or even a pickaxe. It is important to take precautions when using hand tools to avoid being injured by sharp objects hidden within the stump.
Weeping willow trees produce large amounts of acidic sap when they are young that helps break down the cellulose fibers in nearby plants. As the tree matures, the amount of sap produced decreases until it completely stops around 15 years old.