What is a health risk to trees caused by prolonged flooding?

Prolonged flooding poses a significant health risk to trees, primarily through the development of root collar rot. This condition arises when the tree's roots are submerged for extended periods, leading to a lack of oxygen in the soil – a situation known as hypoxia. Roots require oxygen for respiration, and when they are deprived of it, they start to suffer and can become susceptible to pathogens. Waterlogged conditions create a perfect environment for fungi and bacteria that cause rot to thrive, particularly around the root collar, the area where the roots meet the trunk. The decay of these vital structures can severely compromise the tree's stability and health, potentially leading to its decline or death.

Understanding this risk highlights the importance of proper water management and the impact of flooding on tree health, which is crucial for arborists and anyone involved in tree care and management.