NS3975 : Leaf galls on white willow

taken 11 years ago, near to Dumbarton, West Dunbartonshire, Great Britain

Leaf galls on white willow
Leaf galls on white willow
The host tree, a white willow (Salix alba), is shown in NS3975 : Top of embankment. The leaves are similar to those of crack willow; hairs on both surfaces of the leaves give the whole tree a pale appearance (see the link just cited).

The galls are in the form of tight upward rolls of the leaf margin, with some enlargement and reddening of the tissue. At the time of submission, the standard reference work (from 2002) tentatively identified such galls as being caused by the mite species Aculus magnirostris; it noted that more research was needed.

The 2011 revision identifies short twisted inrolling (like most of the examples shown in this picture) as being caused by Aculus craspedobius, and long inrolling by Aculus magnirostris, but it also points out that the only way to be certain about which of the two species is responsible is to identify the mites themselves.
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NS3975, 598 images   (more nearby search)
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Date Taken
Sunday, 15 August, 2010   (more nearby)
Wednesday, 18 August, 2010
Geographical Context
Woodland, Forest 
Plant (from Tags)
Garden Solomons-Seal 
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Closeup  Life 
Near (from Tags)
River Leven 
Galls   (more nearby)
Subject Location
OSGB36: geotagged! NS 3939 7574 [10m precision]
WGS84: 55:56.8664N 4:34.4137W
Camera Location
OSGB36: geotagged! NS 3939 7574
View Direction
Southwest (about 225 degrees)
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Plant Gall 

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