Black root rot

Thielaviopsis basicola

The fungus Thielaviopsis basicola (Berk. & Br.) Ferraris is a soil inhabiting fungus that can cause root rot and branch dieback on a number of woody and herbaceous plants including holly, begonia, geranium, poinsettia, cyclamen, gerbera, and pansy.
Soil temperatures between 55 and 65°F generally favor this fungus, particularly if the soil is wet. The fungus can be found in field soil but has also been found associated with commercial peat moss.
-stunting of foliage and root systems
-blackened areas on roots
-yellowing of leaves between the veins or along the margins
-branch dieback

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