young gall of gall wasp biorhiza pallida on english oak quercus robur. formed after the wasp lays eggs inside leaf buds and

animal apple ball biorhiza botanic botanical branches buds ecology eggs english environment forest formation gall green growing growth infected insect inside larva larvae lays leaf leaves life lifecycle nature oak outdoor pale pallida parasite parasitism pink plant quercus red roadside robur sky small spring summer swell tissues tree wasp wild young