black root rot

Black root rot is a plant disease characterized by dark, often confluent lesions on the roots and sometimes the crown, potentially affecting the entire cortex. It can manifest in different plants, such as apples, caused by the fungus Xylaria mali, or in tobacco and other plants due to Thielaviopsis basicola.1

Another related condition, also referred to as black root, can affect plants like radishes, beets, and sugar beets. This disease is caused by fungi from the genus Aphanomyces and results in brown or black lesions on the roots, leading to deformation and damping off of seedlings. Generally, root rot diseases are caused by various soil-borne bacteria and fungi, leading to plant decomposition.23