I went for a constitutional around Stefen Hill Pocket Park earlier today and the first thing to catch my eye was indeed a mine.
The larvae of Aulagromyza hendeliana mine honeysuckle leaves
and are very common. Stefen Hill Pocket Park, 30 May, 2019
It was on honeysuckle and the insect responsible was a fly, Aulagromyza hendeliana. Its mine, which generally hugs the leaf margin, is distinctive with grains of frass (poo) in the form of evenly distributed grains. Not a lot of people know that - nor, I am sure, do they particularly want to.
In fact, despite the title of today's blog, I failed to find many mines, but plant galls were more evident. Cecidology, the study of plant galls, takes in many disciplines. Some botanical knowledge is essential and the galls themselves can involve many groups of creatures: wasps and flies (entomology) and mites (acarology) are often responsible. Then there are fungi, particularly rusts, so theoretically mycology is involved too, although I admit that at the level at which I record galls it is not really necessary.
Oaks are galled by a particularly large number of creatures and the picture shows the work of a gall (Cynipid) wasp, Andricus curvator. Its galls can confusingly take several forms depending upon which part of the plant has been selected.
The cynipid wasp, Andricus curvator, is a common creator of galls
on oaks. Stefen Hill Pocket Park, 30 May, 2019