Fungi, which are usually visible to the naked eye, cause rusting, spotting, mildewing, and damping-off. Moisture, warmth, and humidity generally encourage both. Control these problems with the proper fungicide or by removing and destroying diseased plants. Purchase disease-free or treated seeds and plants. Crop rotation, staking, mulching, and adequate soil drainage are also important.
Some fungus can only grow on roots of their appropriate host.
Rotating crops, removing the host plant from the tub or area can reduce these. The ways to fight fungus include fortifying the resistance of the plant or find those that fight the parasite. Also look for resistant plant varieties. Well-fed plants are less susceptible and can increase the root forming ability of the plant. Some crop damage can be caused by excess nitrogen fertilizer, which increases some root rots and reduces others.