Disease in Sweetgum Trees: Botrysphaeria berengeriana (Dothiorella)
One disease that can affect Sweetgum trees is caused by a fungus called Botrysphaeria berengeriana, also known as Dothiorella. This fungal infection can cause significant damage to the tree, leading to symptoms such as bleeding necrosis and profuse bleeding on branches and bark.
When Sweetgum trees are infected with Botrysphaeria berengeriana, the affected areas may appear shiny or oily due to the excessive bleeding. This bleeding necrosis is a result of the fungus invading the tree’s vascular system, disrupting the normal flow of sap and causing the tree to bleed.
I encountered this disease firsthand while working on a landscaping project. We had planted several Sweetgum trees in a client’s garden, and after some time, we noticed that some of the trees had developed shiny, bleeding areas on their branches and bark. Upon further investigation, we identified it as a Botrysphaeria berengeriana infection.
To effectively manage this disease, it is important to understand its causes and take appropriate measures. Botrysphaeria berengeriana typically attacks trees that are already weakened or stressed. Therefore, ensuring proper tree care practices can help prevent or minimize the risk of infection.
Some of the factors that can contribute to the susceptibility of Sweetgum trees to Botrysphaeria berengeriana include:
1. Poor growing conditions: Sweetgum trees thrive in well-draining soil with sufficient moisture. Inadequate soil drainage or excessive moisture can weaken the tree, making it more susceptible to fungal infections.
2. Improper pruning: Incorrect pruning techniques or excessive pruning can create wounds on the tree, providing entry points for pathogens like Botrysphaeria berengeriana. It is important to follow proper pruning guidelines and avoid unnecessary or aggressive pruning.
3. Environmental stress: Sweetgum trees may experience stress due to factors like drought, extreme temperatures, or nutrient deficiencies. Stressed trees have a weakened defense system, making them more vulnerable to fungal infections.
To prevent or manage Botrysphaeria berengeriana infection in Sweetgum trees, here are some recommended measures:
1. Maintain proper tree care: Ensure that the trees are planted in well-draining soil and receive adequate water and nutrients. Regularly monitor the tree’s health and address any signs of stress promptly.
2. Prune properly: When pruning Sweetgum trees, follow correct techniques such as making clean cuts and avoiding excessive removal of branches. Prune during the dormant season to minimize the risk of infection.
3. Avoid unnecessary wounds: Take precautions to prevent injuries to the tree, such as removing lawn equipment or other potential sources of damage from the tree’s vicinity.
4. Improve air circulation: Prune neighboring plants or branches that may obstruct airflow around the Sweetgum tree. Good air circulation can help reduce humidity and minimize the chances of fungal growth.
5. Apply fungicides: In severe cases, where the infection has spread extensively, fungicides may be used as a last resort. Consult with a professional arborist or horticulturist for appropriate fungicide recommendations and application methods.
It is essential to note that prevention and early detection are key in managing Botrysphaeria berengeriana infection in Sweetgum trees. Regular inspections, proper tree care, and prompt action can help protect the trees and mitigate the impact of this fungal disease.
The disease affecting Sweetgum trees discussed here is caused by the fungus Botrysphaeria berengeriana, also known as Dothiorella. This fungal infection can lead to bleeding necrosis and profuse bleeding on the branches and bark of the tree. By implementing proper tree care practices, such as maintaining optimal growing conditions, practicing correct pruning techniques, and addressing environmental stress, the risk of infection can be minimized. Early detection and appropriate management strategies, including the use of fungicides if necessary, can help protect Sweetgum trees from the damaging effects of Botrysphaeria berengeriana.
