What type of rot is commonly found in poorly drained, heavy clay soils?

Annosum root rot is commonly found in poorly drained, heavy clay soils due to the specific environmental conditions that these soils create. This type of rot is caused by the fungus Heterobasidion annosum, which thrives in moist, anaerobic conditions typically found in such soil types. The dense structure of heavy clay soils can lead to waterlogging, which is conducive to the development of this fungal pathogen.

In these environments, the roots of trees can become compromised because the excess moisture hinders the necessary gas exchange and encourages fungal growth. The fungus invades the roots and can continue to spread through the tree, leading to significant decay and ultimately affecting the overall health of the tree. The prevalence of Annosum root rot in these specific soil types highlights the importance of soil moisture levels and drainage in forest ecology and tree health management.