1884, anglicized from Modern Latin aphides, plural of aphis, coined by Linnaeus (1758), though where he got it and why he applied it to the plant louse are mysteries. The theory favored by OED as "least improbable" is that it derives from the plural of Greek apheides "unsparing, lavishly bestowed," in reference either to the "prodigious rate of production" of the insects or their voracity. They also are known as ant-cows.
1. The aphid is now laying waste to the wheat and barley fields.
2. Since aphid population may become resistant to organophosphorus compounds, avoid excessive spraying.
3. Aphid count on plants in fields do not correlate with virus spread in the same fields.
4. In general an aphid cannot or hardly identify its host at a distance.
5. There is adequate variability in plants to breed for resistance to certain aphid vectors.