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Rhopalosiphum maidis
Corn aphids occur mainly on barley, but may attack all cereals and some grasses. They suck sap from plants and also produce honeydew, which can lead to the build of black sooty mould. When numbers are high, significant yield reductions can occur. Adult corn aphids are about 2 mm in length and have an oblong shaped body which ranges from light green to dark olive in colour. They have two dark patches on the abdomen near the base of the cornicles (siphuncles). Adults have antennae which extend about half the body length and may also have wings. Nymphs are similar but smaller in size.
