Synonyms and other taxonomic changes
Formerly a separate family, Eriosomatidae.
Tree of Life places many (all?) of the included genera in family Pemphigidae.
Identification
Cornicles are reduced or absent; sexual forms lack mouthparts
(1).
Life Cycle
Nearly all members of this subfamily alternate between host plants, generally with a woody primary host (on which overwintering eggs are laid, and on which some species induce galls) and an herbaceous secondary host
(1).
See Also
Subfamily
Hormaphidinae includes two species that cause galls on witch hazel. The
Manzanita Leaf Gall Aphid is in subfamily Tamaliinae.
(The following information is based on BugGuide's images and may be modified based on future observations.)
Most woolly aphids are in subfamily Eriosomatinae. However, there are several exceptions:
The Asian Woolly Hackberry Aphid (Calaphidinae: Shivaphis celti) has red eyes, banded antennae, and distinctively patterned wings.
The Woolly Beech Aphid (Phyllaphidinae: Phyllaphis fagi) forms woolly masses on the undersides of beech leaves (primarily European varieties). We do not have adult images for this species yet.
The Balsam Twig Aphid (Mindarinae: Mindarus abietinus) produces white fluff on fir twigs. Adults have only a thin, light coating of this material.
The Spiny Witch Hazel Gall Aphid (Hormaphidinae: Hamamelistes spinosus), is covered with waxy powder but is not woolly:
The Witch Hazel Cone Gall Aphid (Hormaphidinae: Hormaphis hamamelidis), produces white fluff inside the galls, but the adults apparently have little of this material on them:
Look at wing venation for further clues in distinguishing among these. Below is a Pemphigus (Eriosomatinae) for comparison.
