oak gall.it is caused by an insect called cynips quercusfolii that lays an egg in the tissue of the leaves

plant flower leaf produce nature tree food green wildlife branch invertebrate soil autumn grass wildflower shrub oak gall caused called cynips quercusfolii lays egg tissue leaves substances secreted larva cause tissues grow enjoying safe shelte arthropods autumn background ball botany brown closeup cynipidae cynips quercusfolii detail disease ecology environment fall forest gall oaks apple wasp green infected infection insect insects isolated larva larvae leaf macro natural nature galls leaves organic outdoor parasitism plant product quercus pubescent reproduction round seasonal secretions tree wasps yellow