Symptom	Plausible Causes	Suggested Treatment
Rotting	Human Causes Excessive watering Environment or Disease Verticillium wilt
The plant appears swollen	Environment or Disease Club root, crown gall, oak root fungus Pests Root knot nematodes, grape phylloxera, borers
The plant root appears black	Human Causes Excessive watering Environment or Disease Fusarium wilt or root rot
White looking fungus	Environment or Disease Oak root fungus