young gall of gall wasp (biorhiza pallida) on oak (quercus robur). formed after the wasp lays eggs inside leaf

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