Gall
insect-induced growth on plant. often very distinctive and even species-specific structures developed when insects, fungi or bacteria stimulate abnormal growth of a plant
Galls (from the Latin galla, 'oak-apple') or cecidia (from the Greek kēkidion, anything gushing out) are a kind of swelling growth on the external tissues of plants. Plant galls are abnormal outgrowths of plant tissues, similar to benign tumors or warts in animals. They can be caused by various parasites, from viruses, fungi and bacteria, to other plants, insects and mites. Plant galls can be such highly organized structures that their cause can be determined without the actual agent being identified. This applies particularly to insect and mite plant galls. The study of plant galls is known as cecidology.
Taxonomic range
Plant galls are caused by a wide range of organisms, including animals such as insects, mites, and nematodes; fungi; bacteria; viruses; and other plants.
Insects
Insect galls are the highly distinctive plant structures formed by some herbivorous insects as their own microhabitats. They are plant tissue which is controlled by the insect. Galls act as both the habitat and food source for the maker of the gall.
“Gall” enters the record as insect-induced growth on plant. often very distinctive and even species-specific structures developed when insects, fungi or bacteria stimulate abnormal growth of a plant. Crown Archives preserves that source wording while asking what Gall, insect-induced and growth can confirm, complicate or overturn.
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“Gall” is worth following because a concise public description often conceals a longer documentary argument. Here, Gall, insect-induced and growth provides the most credible route into that argument.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Sep 8, 2026. The linked authority identifier is Q224107. The Library of Congress control number is sh85052868. 1 of 1 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Gall” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.