Appearance
The gall is a green or reddish, rounded pouch or pustule on the upperside of a leaf, which also protrudes on the lower surface of the leaf. There is a slit-like opening on the underside of the leaf which, when mature, is hairy inside but the hairs do not protrude outside of the gall. Many mites can be seen within the opening.The galls are found on white willow, eared willow, grey willow, "S. eriocephala", crack willow, "S. integra, bay willow, purple willow, Sitka willow, "S. smithiana", almond willow and common ossier.
;Similar species
It is possible that "A. tetanothrix" is one of a number of closely related species, and the galls on "S. alba" could be caused by "A. salicisalbae".
Distribution
"Aculus tetanothrix" has been recorded from Germany, Slovenia, Great Britain, the Netherlands, Norway, Russia, Sweden and the USA.References:
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