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The following 2 entries include the term grain aphid.
apple grain aphid
noun: a yellowish green aphid (Rhopalosiphum fitchii) with dark bands on the abdomen that produces its fertilized eggs on apple and related trees and feeds on their leaves in early spring but passes most of the growing season on various small grains and grasses
English grain aphid
noun: a pale green aphid (Macrosiphum avenae) with dark markings that is native to Europe but widespread in North America and that feeds on grasses and small grains, being especially destructive when feeding on the developing heads of grain
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Merriam-Webster unabridged
