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Updated: Feb 25, 2010 6:24am PST
Galls are formed by the host plant as a reaction to chemicals being injected by gall wasps. The gall forms protection to the larvae of the wasps until they emerge in the spring as young adult wasps. Each Gall wasp specialises in a particular plant which aids identification of the wasp larvae by identifying the plant on which the Gall is f ...
Updated: Jan 26, 2010 12:29pm PST