Infested with or relating to aphids; affected by the presence of many aphids.
Formed from 'aphid' plus the adjective suffix '-ious,' following English patterns of creating descriptive words from noun roots. This term likely emerged in agricultural contexts.
An 'aphidious' plant tells you something's wrong—it means the plant is under pest attack, and observant gardeners can spot this as a sign to investigate what's causing the plant stress.
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