Rhopalosiphum maidis Fitch Cerealleaf aphid

This entirely viviparous, anholocyclic species occurs only on members of the Poaceae, especially wild grasses. During the summer, it will also infest cereal crops, especially barley, maize and sweet corn. Apterae are c. 1.0-2.5 mm long, and pale bluish-green and velvet-like, with a small purplish patch at the base of each siphunculus; the antennae are short and dusky, and the legs and siphunculi black and relatively short. The abdomen of alatae is uniformly yellowish-green or dark green. Infestations are rarely of significance in the UK, although the aphids are vectors of viruses.

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