Phylloxera caryaemagna

Appearance

Globular and light green or yellowish-white, some with a hint of crimson, spongy with short pubescence, diameter 4.0–20.0 mm; occurs along midvein of leaf with gall tissue appearing to protrude through leaf tissue above and below much more convex with a slit-like opening when mature; also occurs on petioles.

Naming

Phylloxera caryaemagna has previously been considered a synonym of Phylloxera caryaecaulis, and the two are very similar in appearance. Dr Hamilton notes in couplets 12 and 13 of her first key (page 115 of the pdf), that P caryaemagna is pubescent and spongy, while caryaecaulis has hard walls and a glabrous exterior.

Habitat

Hosts: Carya cordiformis, tomentosa, pallida