Aphelinus mali is a parasitoid wasp that exploits the woolly apple aphid, a pest of apple trees. It is native to the northeastern United States but has been introduced to other parts of the world as a

Samuel Stehman Haldeman was an American naturalist and philologist. During a long and varied career he studied, published, and lectured on geology, conchology, entomology and philology. He once confid