Plural of deformities or gall-like growths on plants caused by mite infestation or damage.
From Latin 'acarus' (mite) plus 'cecidia' (plant galls caused by parasites), referring to plant deformities from mites.
Acarocecidia on plants are like plant acne—they're abnormal growths triggered by mite saliva injected during feeding, and different mite species cause completely different shapes of deformity on the same plant.
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