The study of plant galls and their formation by insects, mites, fungi, and other organisms; the branch of science investigating cecidiums.
From cecidium plus -logy (from Greek -logos meaning 'word' or 'study'); alternative form of cecidiology with simplified construction.
A single oak tree can host thousands of different gall species, turning it into a living museum of specialized insect-plant relationships—this is why oak trees are a cecidologist's paradise.
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