 English grain aphid colony on wheat head English Grain Aphid These green, yellowish-green, red, or purple aphids are 2.5 to 3 mm long. Cornicles and antennae are black, legs mostly black. These aphids infest leaves early but suck sap from grain heads as soon as heads emerge. They migrate from winter cereals to spring cereals and can also serve as a vector of barley yellow dwarf virus. Host plants: cereals, roses, cattails, wild grasses.
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