beech galls growing on the upper side of green beech leaves

leaf green plant flower tree branch nature shrub insect invertebrate animal upper side bubble mountain zone sub-mountain pustule top blush pink red growth appendix tumor infestation plague foliage galls summer ecology detail wild forest leaves mikiola fagi egg larva larvae mosquito tissue abnormal growths gnat cecidomyiidae beech gall midge european mite damage infection parasitic infected parasite growing