Mite infestation of the flower buds inhibits elongation of the flowering stems and lateral branches. There is considerable distortion of the galled structure, which appears cauliflowerlike and of variable size or which forms clusters of aborted and contorted lateral branches, foliage, and flower heads. Since the flower stems fail to produce flowers, the reproductive capacity of the plant is greatly reduced. . . . Eriophyes chondrillae was introduced into California as a biological control agent.

- Hartford Keifer,Edward Baker,Tokuwo Kono,Mercedes Delfinado,William Styer: (1982) An Illustrated Guide to Plant Abnormalities Caused by Eriophyid Mites in North America^©