Woolly
Guides
Eriosoma americanum
Woolly Elm Aphid
Eriosoma americanum, commonly known as the woolly elm aphid, is a North American aphid species that alternates between two host plants: American elm (Ulmus americana) and Saskatoon (Amelanchier alnifolia). The species produces distinctive woolly or cottony wax secretions that give it its common name. Heavy infestations on American elm cause leaf curling and produce visible dark patches and cottony masses. Like other aphids, it excretes honeydew while feeding on plant sap.
Plocamaphis flocculosa
Large Waxy Willow Aphid
Plocamaphis flocculosa is a large aphid species known for its conspicuous waxy covering. It is specialized on willows (Salix species) and produces dense flocculent wax secretions that give it a distinctive woolly appearance. The species is native to North America and has been introduced to parts of Europe, where it has established populations. Its common name directly references the characteristic waxy filaments that coat the body.