The adult aphids (mature insects) are approx. 1.5 mm in length depending on the species, with green, red or brown coloration; both winged and wingless forms appear. Depending on the species, the body is elongated (large and pale cereal aphid) or oval (oat cereal aphid), the abdominal tubes (siphunculi) are dark or, in the pale ceral aphid, light. The larvae resemble the mature insects.
Aphid [Aphis sp]
Aphids, e.g. large cereal aphid, pale cereal aphid, bird-cherry or oat cereal aphids Sitobion arenae (Grain aphid), Metopolophium dirhodum (Rose grain aphid), Rhopalosiphum padi (bird cherry aphid) Diuraphis noxia (Russian wheat aphid), are found on all cereals as well as other grass species. Winter hosts: Grasses (large cereal aphid), roses (pale cereal aphid), bird-cherries (oat cereal aphid)
Pattern of damage
The sucking activity of the aphids generally does not cause any typical symptoms, however, the colony-forming aphids themselves are visible as well as the honeydew they excrete, if this occurs on the developing ear yield loss and reduced crop quality will occur. Cereal aphids can transmit barley yellow dwarf virus to young cereal plants which can cause patches of plant stunting, yellowing and loss of yield.