By Philcr
United Kingdom 
Anyone know what this is on our Diamond Jubilee Oak - I am not an expert by any stretch of the imagination
4 Sep, 2013
Answers
should say another infestation. lift fallen leaves and put in council compost bin or burn them.
4 Sep, 2013
its one of the oak galls or spangle gall. an insect has had a feed on the sap and this is the 'wound response' of the oak. the leaves next year will be clear unless they get another in.
4 Sep, 2013