The clover cyst nematode attacks red clover roots and crowns. It has been found only in central Pennsylvania, and its distribution throughout the state is not known. Rotating fields out of clover for two or more years should keep this pest under control. Disease control Crown and root rot fungi, especially Fusarium spp. This problem, coupled with injury caused by root-feeding insects, limits red clover stand longevity.
Insects feeding on the leaves and stems also stress the plants and favor rapid root rot.
The development of root rot is slower when good management practices are used to minimize plant stress. Management practices that help to slow down root rot include maintaining adequate potassium and phosphorus levels, maintaining optimal soil pH for vigorous plant growth, and following recommended harvesting schedules. Bean yellow mosaic virus is the predominant virus in red clover, occurs generally throughout the state, and undoubtedly contributes to premature decline of red clover stands. Currently, no varieties are highly resistant to this disease. Northern and southern anthracnose afflict red clover.