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

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