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WordReference Random House Unabridged Dictionary of American English © 2024pota′to psyl′lid, - Insectsa tiny homopterous insect, Paratrioza cockerelli, occurring in some areas of the western U.S., western Canada, and Mexico: a serious pest to potatoes, tomatoes, eggplants, and peppers, the nymphs acting as vectors in the transmission of psyllid yellows. Also called tomato psyllid.
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