Florist Home :: Flower Guides :: Hamamelis Pests and Diseases
Saddled prominent is a green to brown or yellow caterpillar with a reddish brown spot on its back. It eats the leaves. No chemicals are listed because outbreaks of the insect are short-lived. At other times it is very rare.
Witchhazel leaf gall aphid causes galls 1/2 inch (1.25 cm) long. The galls are green, sometimes with reddish tips, and are formed on the upper leaf surfaces. Natural enemies usually control this insect; hand picking and destroying infested leaves will also be helpful.
The spiny witchhazel gall aphid causes galls 3/4 inch (1.9 cm) long with long, coarse spines. The galls are green tinged with red. Both this aphid and the previous one migrate to birch for part of their life cycle.
Eastern tent caterpillar feeds on witchhazel leaves. Removing the nest by hand will control the infestation.
Related information on Hamamelis pests: Eastern Tent Caterpillar
Several genera of fungi are listed as causing leaf spot on witchhazel.
Various genera of powdery mildew cause a white coating on the leaves.
Related information on Hamamelis diseases:
Powdery Mildew
Fungal and Bacterial Leaf Diseases
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This information kindly supplied by Michigan State University Extension, Ornamental Plants.
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