By Oaks
United Kingdom 
I have some oak saplings (about 4/5 years old).
I have recently noticed that some of them have pink/red nodules under the leaves. These appear to be attached into the veins of the leaves with what looks like little needles. Can you please give any advice.
3 Jul, 2011
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« Hi can anyone tell me what kind of leaves are these cheers
they are leaf galls. it is the plants response to a sap sucking insect. the new leaves next year will be fine until they get 'bitten' again.
oaks also get a gall that look like dull beige sequins, a leaf gall called 'spangles'
3 Jul, 2011