Pacific Northwest 1998 An Online Guide to Plant Disease Control

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OSU Extension Office
 
Clover (Trifolium sp.) -- Fusarium Root and Crown Rot
 
Cause: Several fungi, primarily Fusarium spp. Stress such as frequent cutting, winter injury, nutrient deficiencies, and wounding favor development of this disease. Fungal rots often are associated with insect injury caused principally by the clover root borer and clover root curculio. The disease can severely limit red clover production.
Symptoms: Plants are pale green and stunted. They may wilt in hot weather. Roots and crowns have darkened, diseased tissue.

Red clover with crown rot.

 
Cultural control:

  1. Rotate out of legumes 3 to 4 years, ideally to grasses or grains.
  2. Control insects. See the PNW Insect Control Handbook.
  3. Maintain good plant vigor through high phosphorus and potassium levels, desirable soil pH, and recommended harvest schedules to avoid plant stress.
Content edited by: Cynthia M. Ocamb on January 1, 2009
 
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