Salix caprea (great sallow), see distribution map. Also recorded on S. cinerea * (grey sallow), S. viminalis ** (osier), S aurita *** (eared sallow) and S. repens **** (creeping willow).
On Salix caprea, feeds on the underside of a leaf, beneath the down, often curling the edge or between joined leaves. On Salix cinerea in Northern Scotland M R Young (pers. comm.) noted that leaves were not spun together. As the leaves were not hairy, the larva fed on the underside of an individual leaf from a silken tube, with frass caught in it. The tube lead to the area of feeding, which was fenestrated and in a general way, the tube was rather like that made by Gypsonoma dealbana, but finer and not expanding.
In October 2012 a well developed larva was found inside a gall on Salix aurita in Garten Wood, Abernethy Forest NNR (NH954188) - no frass was evident. There was no other occupant in the gall and following pupation, C. notatella emerged in May 2013. It is assumed the larva crawled into an existing, empty, gall purely for pupation. Two similar galls nearby were empty. An article on this find was published by P. Shirley in Cecidology Vol.28, No 2:55.
* Bred extensively across England; first noted in Berkshire 1987 (M. F. V. Corley); more recently in North Northumberland 2015 (T. Tams).
** Bred in Berkshire 1977 (R. Fairclough).
*** Bred in Ireland, Scotland and southern England; first in West Ross 1965 (E. C. Pelham-Clinton); more recently in East Ross 2007 (R J Heckford) and Isle of Mull in 2024 (C. Austick)
**** Bred in East Inverness-shire 2000 (R J Heckford).
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