tetraneura ulmi elm sack gall aphid also known as fig gall, is a species of aphid in the family aphididae. mite causing

gall ulmi tetraneura plant elm tree leaf parasite pest parasitic insect green closeup ulmus aphid hemiptera bug dangerous nature foliage outdoors disease wildlife illness entomology field growth infected gardening floral infection protection mite natural plantation protect springtime summer macro infestation farmland detail homoptera farming agriculture biological aphididae red