Aceria ilicis
Description
Aceria ilicis is a mite which causes felt galls to form on the leaves of Holm Oak. The upperside of the leaf may have a bulge about 2 to 3mm high, with a corresponding depression on the underside with a rusty brown erineum; usually several galls on a leaf; mites live amongst the hairs. The gall is seen more readily than the mite.
Identification difficulty
Adult 
Gall 
Habitat
On the leaves of Holm Oak.
When to see it
All year round.
UK Status
Seems to be fairly frequent but under recorded in Britain.
VC55 Status
Little recorded but probably fairly frequent in Leicestershire and Rutland.
Maggie Frankum
University of Leicester Botanic Garden, Oadby
20 March 2014
Aceria ilicis mite gall on Holm Oak, upper leaf surface
Maggie Frankum
University of Leicester Botanic Garden, Oadby
20 March 2014
Aceria ilicis mite gall on Holm Oak, lower leaf surface
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