A fungal disease that attacks the root system of trees.
Leaves turn yellow and die and branches die back from the tips. The plant usually dies after a period of hot weather puts it under severe water stress because of its damaged root system. Portions of a tree may die if only a portion of the root system is infected.
There are few root hairs or fine roots and the fine roots are usually brown and brittle.
Canola and Clover:
Infected roots have a dark discolouration and are decayed. Plants can be easily pulled from the ground. Often occurs in patches especially in wet areas and poorly drained heavy soils.