Gall and gall-former insects
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Key Words：galls, gall\|former insects
Abstract：
Galls are some special tissue induced by gall\|former such as insects on host plants. Most of galls provide nutrition and protection for gall-|former. Galls are very useful resources for both utilization and scientific research. Moreover, many of gall\|former insects are quarantine pests of agro\|forestry. In this paper, we clarified the site of gall-|form on host plants, taxon of gall\|former, morphological structure of galls, chemical composition of galls, gall effect on its host plant and utilization of galls, respectively.