Witch-hazels or witch hazels (Hamamelis) are a genus of flowering plants in the family Hamamelidaceae, with three species in North America (H. ovalis, H. virginiana, and H. vernalis), and one each in Japan (H. japonica) and China (H. mollis). The North American species are occasionally called winterbloom.
Diseases Affecting Witch Hazel
Phyllosticta
Witchhazel blight is caused by a fungus, Phyllosticta hamamelidis. The fungus causes brown lesions bordered by darker brown margins.
Affected Species:
Insects Affecting Witch Hazel
Spiny Witchhazel Gall Aphid
The aphid produces raised ribs or “corrugations” on the upper leaf surface that match deep furrows between the veins.
Affected Species:
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