Gall
Guides
Caryomyia sanguinolenta
Hickory Smooth Gumdrop Gall Midge
Caryomyia sanguinolenta is a gall midge species in the family Cecidomyiidae, commonly known as the hickory smooth gumdrop gall midge. The species induces distinctive galls on hickory trees. It was first described by Osten Sacken in 1862.
Pachypsylla celtidisasterisca
Hackberry Star Gall Psyllid
Pachypsylla celtidisasterisca is a species of hackberry psyllid native to North America, known for inducing distinctive star-shaped galls on hackberry leaves. Adults emerge in fall and seek shelter to overwinter, becoming a nuisance when they aggregate on building exteriors. The species is one of approximately seven Pachypsylla species associated with hackberry, each producing characteristic gall morphologies that serve as the primary identification cue.
Pachypsylla cohabitans
Pachypsylla cohabitans is a species of hackberry psyllid described in 2001. Like other members of the genus Pachypsylla, it induces galls on hackberry trees (Celtis species). The species name 'cohabitans' suggests an association with shared or communal gall structures, distinguishing it from other Pachypsylla species that typically form individual galls. It belongs to the family Aphalaridae, a group of sap-feeding insects commonly known as jumping plant lice.
Phylloxera deplanata
pecan leaf phylloxera, pecan phylloxera
Phylloxera deplanata is a tiny, soft-bodied insect in the family Phylloxeridae, closely related to aphids. It is a significant pest of pecan trees (Carya illinoinensis), causing the formation of galls on leaves, shoots, and nuts. The species overwinters as eggs in bark crevices and emerges in spring to feed on new growth, inducing abnormal plant tissue development. Unlike the pecan leaf phylloxera (which forms galls on leaves only), this species attacks shoots and nuts, making it more economically damaging. Heavy infestations can reduce yield, impair tree vitality, and diminish subsequent production.
Torymus flavicoxa
Torymus flavicoxa is a parasitoid wasp in the family Torymidae, a group known for attacking insects within plant galls. The species has been recorded as a parasite of psyllid nymphs inhabiting hackberry leaf galls. It is distributed across Canada from British Columbia to Ontario.