PhysOrg (May 9, 2012) | ARS scientists have developed a system using DNA “barcodes” to identify emerging biotypes of Russian wheat aphids, an insect pest that does more than $200 million in damage annually to wheat and other cereal crops in the United States. Russian wheat aphid adult next to its young. This aphid gives live birth to young that are identical clones of itself during the asexual phase of its lifecycle. Credit: Gary Puterka