Phoma blight in plants is particularly damaging to a number of crops and ornamentals, especially to vinca groundcover. Infections by this fungus are most common in wet & cool conditions and it survives in soil, and in the old plant debris that is under your plantings. Signs of a phoma infection include wilting, browning, and death of runners and entire plants and you’ll also see dark brown to black lesions that girdle the stems. Phoma blight spreads rapidly, and any health part of a plant that is touching infected soil is at risk of succumbing.

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Source: Gardening Know How