Gall-aphid
Guides
Cerataphis
witch hazel aphid, palm aphid
Cerataphis is a genus of aphids in the family Aphididae, tribe Cerataphidini. The genus comprises approximately 10–12 described species distributed across tropical and subtropical regions worldwide. Species in this genus are associated with host plants in the families Styracaceae (witch hazels), Arecaceae (palms), and Orchidaceae. Several species exhibit host alternation between primary hosts (Styrax species) and secondary hosts (palms or orchids). Some species are economically significant as pests of coconut, oil palm, and ornamental palms.
Kaltenbachiella ulmifusa
Slippery Elm Gall Aphid
Kaltenbachiella ulmifusa, commonly known as the Slippery Elm Gall Aphid, is a gall-forming aphid species in the family Aphididae. It induces distinctive galls on elm trees (Ulmus spp.), particularly on slippery elm (Ulmus rubra). The species is native to North America and has been documented primarily in the eastern and central United States. Like other members of the subfamily Eriosomatinae, it exhibits a complex life cycle involving host alternation.
Pemphigus knowltoni
Pemphigus knowltoni is a species of aphid in the family Aphididae, described by Stroyan in 1970. It belongs to the genus Pemphigus, a group of aphids commonly known as gall aphids or poplar gall aphids due to their habit of inducing gall formation on host plants. The species is part of the subfamily Pemphiginae, which contains many species with complex life cycles involving host alternation between primary woody hosts (typically poplars in the genus Populus) and secondary herbaceous hosts. Very little specific information about P. knowltoni has been published in the accessible literature.