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Black Root Rot of Strawberry
This article was published originally on 5/12/2010
Black root rot of strawberry is a disease complex of three or more fungi. Among the most damaging are Fusarium, Rhizoctonia and Pythium. Pythium tends to predominate in sandy soils and Rhizoctonia on high clay content soils. Plants that have been under stress such as freezing, water logging, invasion of fungi or damage by nematodes (Pratylenchus spp.) are more susceptible to this disease. Affected roots show a black discoloration and extensive death and do not function for water or nutrient uptake. Parts of the crown and lower leaves may also show black discoloration. See the photo below and Oregon State University Extension Plant Disease Online Guide. Declining plant vigor and productivity are the most prevalent and typical symptoms of black root rot.