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Is Bot Canker or Botryosphaeria dothidea the Cause of Your Ornamental Trees’ Decay?

Bot Canker or Botryosphaeria dothidea is a fungus that often affects various types of woody shrubs and trees and can cause extensive dieback. This pathogen invades through wounds in the bark, causing the formation of cankers. The cankers then expand and girdle twigs, branches, and even the trunk, leading to the eventual decline of the plant. Botryosphaeria dothidea is just one of many species of canker-causing fungi.

Once you identify the species, the next step is to determine the best course of treatment. Some cankers, like those caused by Botryosphaeria dothidea, are very difficult to treat and often result in tree death. In these cases, the best course of action is often to treat the affected tree(s) before the fungus has a chance to spread to healthy trees. Hence, the prompt tree canker disease treatment is crucial.

If you have a small number of trees that are not yet infected, you may be able to save them by offering care and treatment to all of the cankered branches. It will help prevent the spread of the fungus and give the trees a chance to heal.

Botryosphaeria dothidea is a destructive fungus that can quickly infect even healthy trees. If you think your trees may be affected, it’s crucial to act quickly and consult with a tree care professional. They will be able to help you determine the best course of action to save your trees.

Everything About Botryosphaeria Canker

Botryosphaeria Canker is one of the most frequent canker diseases. It is a type of tree canker disease caused by the fungus Botryosphaeria dothidea. This fungus is found throughout the world and can infect many different types of trees, including apple, oak, maple, and elm. Botryosphaeria canker often affects stressed or damaged trees.

Botryosphaeria dothidea is a species of ascomycete fungus in the genus Botryosphaeria. It is a plant pathogen and has a wide host range, including many trees and shrubs.

The fungus causes canker diseases in its hosts. However, the symptoms include dieback of branches, blackened bark, and sunken areas on the trunk or branches. The fungus can also cause fruit rot in some hosts.

The fungus produces black, slightly curved conidia (asexual spores) that are borne on branched conidiophores. The conidia are 2–3 µm in diameter and have a smooth surface. The sexual phase of the fungus has not been observed.

Botryosphaeria dothidea is cosmopolitan in distribution and has been reported from North America, Europe, Asia, Africa, and Australia.

In North America, the fungus has been reported on more than 100 host species in 22 families. Some of the common hosts include apple (Malus Domestica), crabapple (M. sylvestris), pear (Pyrus communis), quince (Cydonia oblonga), cotoneaster (Cotoneaster spp.), hawthorn (Crataegus spp.), mountain ash (Sorbus spp.), and serviceberry (Amelanchier spp.).

The best time to call professionals for Botryosphaeria Canker treatment is in the early spring before the fungus has a chance to produce spores. Several fungicides are effective against the fungus, but copper sulfate is the most common one used.

The fungicide is applied to the affected areas of the plant and then covered with a plastic sheet to create a humid environment. You have to repeat the treatment every two weeks until the fungus is under control.

Reasons For Bot Canker Infestation

There are several reasons why your plant may be infected with Botryosphaeria dothidea, including:

  • The plant is stressed or damaged
  • The plant is in a humid environment
  • The plant is in an area with poor air circulation
  • The plant is in an area with high temperatures
  • The plant is in an area with high humidity

Will It Affect Your Ornamental Trees?

Botryosphaeria Canker will affect any type of tree, including ornamental trees. The fungus is often spread by gardening tools, so it is crucial to disinfect your tools after each use.

How Does Bot Canker Affect Your Ornamental Trees?

The disease cycle begins when the fungus produces spores that are spread by wind or rain to new trees. The spores germinate and infect the tree through wounds in the bark. The fungus then grows inside the tree, causing Cankers to form. The Cankers may be small at first, but they will eventually enlarge and infect the branches or trunk of the tree.

If the Canker goes unnoticed, the newest leaves are generally the first indication of a problem. Tiny, black fruiting bodies of the fungus will appear on the underside of these leaves. These lesions will eventually turn brown and cause the leaves to fall off prematurely.

As the disease progresses, Cankers will form on the twigs, branches, and trunk. The Cankers are oval or round and are sunken in the center. You will often find them surrounded by a yellow halo. However, the Cankers may ooze sap or other fluids.

Severely infected trees will exhibit dieback of the leaves and branches. The tree may also produce abnormal growths, such as galls or burls.

Botryosphaeria canker is a severe disease of fruit trees, such as apples, peaches, and plums. The fungus can also infect other types of trees, such as oaks and pines.

The best way to prevent Bot Canker is to plant disease-resistant trees. If you already have trees that are susceptible to the disease, you can help prevent it by watering the trees during dry periods and fertilizing them according to the manufacturer’s directions. You should also avoid wounding the trees.

Also Read: Most Afflicted Plants & Trees By Botryosphaeria Canker

Prevention Tips

  • Plant disease-resistant trees
  • Water trees during dry periods
  • Fertilize according to the manufacturer’s directions
  • Avoid wounding the trees

Symptoms Of Bot Canker

Symptoms of Botryosphaeria Canker include small, black spots on the leaves, twigs, and fruit of the tree. The spots are actually tiny fruiting bodies of the fungus. As the disease progresses, the spots enlarge and turn brown. The leaves may then turn yellow and fall off prematurely. Cankers may also form on the trunk and branches of the tree. So, Botryosphaeria fungus treatment from experts will help retain the health of infected trees.

Damages Caused By Bot Canker

Botryosphaeria Canker is a serious disease of fruit trees, such as apples, peaches, and plums. The fungus can also infect other types of trees, such as oaks and pines. The disease can cause dieback of the leaves and branches, and may also damage the tree.

What To Do After You Diagnose Bot Canker?

Botryosphaeria fungus and canker are difficult to control once it has infected a tree. Pruning out infected twigs and branches can help to slow the spread of the disease. Tree wounds should be promptly sealed with pruning paint or wound sealant to prevent the fungus from entering. Fungicide applications may also be necessary to protect against Botryosphaeria Canker. Always read and follow the label directions when using any pesticide. Opt for Tree Health Services for accurate treatment and fungicide applications to safeguard your infected and healthy trees.

Encourage Healthy Growth Of Ornamental Trees To Prevent Bot Canker

There are several ways to help prevent Bot Canker, including:

  • Encourage the healthy growth of your ornamental trees by watering them regularly and fertilizing them as needed.
  • Treat dead or dying branches from your trees, as these can provide entry points for the Botryosphaeria fungus.
  • Remove any fallen leaves or branches from infected trees, as the fungus can overwinter in such debris.
  • Avoid wounding your trees, as this can also provide an entry point for the fungus.
    • Take proper care, and follow all the essential steps to improve the health of the tree.
    • Offer balanced nutrients to your trees and plants to enhance their immunity and vigor.


If you find evidence of Bot Canker on your trees, prompt treatment is essential to prevent the spread of the disease. Several fungicides are available commercially for treating Bot Canker, and you should apply them according to the manufacturer’s instructions. Be sure to focus on any areas of the tree where the fungus is most active, such as cankers, dead branches, or leaf spots. With proper care and treatment of Tree Canker disease, you can help keep your ornamental trees healthy and free of infestation.

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