English grain aphid
The English grain aphid is a yellow-green to reddish brown, medium sized aphid with black antennae, cornicles, and leg joints. It usually appears later in the season than the other cereal aphids.
DAMAGE: English grain aphid is found on the leaves and stem of barley and oats, but in wheat it frequently colonizes the heads. It causes little injury except in wheat when present in extremely high numbers, more than 80-100 per head. It is thought that large amounts of honeydew produced by this aphid, particularly when in the head, may clog harvesting equipment; however, this has not been confirmed.