Pemphigus
Guides
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.
Pemphigus monophagus
Pemphigus monophagus is a root-feeding aphid in the family Aphididae, described by Maxson in 1934. It belongs to the genus Pemphigus, which comprises aphids that typically form galls or inhabit root systems of host plants. Like other Pemphigus species, it is frequently misidentified in agricultural contexts and has been confused with other root-infesting aphids in online discussions.
Pemphigus populivenae
Sugarbeet Root Aphid
Pemphigus populivenae is a root-feeding aphid in the family Aphididae, commonly known as the Sugarbeet Root Aphid. It belongs to the genus Pemphigus, which comprises gall-forming and root-feeding aphids primarily associated with poplar (Populus) species as primary hosts. The species has been historically documented in North America since the mid-19th century. Like other Pemphigus species, it exhibits a complex life cycle involving host alternation between poplar trees and secondary herbaceous hosts.
Pemphigus tartareus
Pemphigus tartareus is a North American aphid species in the family Aphididae, described by Hottes and Frison in 1931. It belongs to the genus Pemphigus, which comprises root-feeding aphids often associated with gall formation or subterranean development on host plants. The species has been historically confused with other root-infesting aphids in agricultural and horticultural contexts, particularly in discussions of "root aphid" pests.