Apple grass aphid

Rhopalosiphum oxyacanthae apterae on apple are small light green to yellow-green aphids that are elongate-oval in shape. They have fairly well-marked dark green stripes down the centre of the back and along each side. The frontal head tubercles are low, with the median frontal tubercle about the same height as the antennal tubercles. The siphunculi are quite short - about one tenth as long as the body - and pale with dusky tips. The 5-segmented antennae are about a third the length of the body. The body length of the adult aptera on the primary host is 2.1-2.6 mm. Winged Rhopalosiphum oxyacanthae viviparae (see second picture below) have blackish head, thorax and siphunculi and a green abdomen with some brown plates and pigmentation.