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Aceria chondrillae
''Aceria chondrillae'' 〔(''Aceria chondrillae'' ) at (Australian Government's Department of the Environment and Water Resources )〕 (Chondrilla gall mite, Skeletonweed gall mite) is a gall forming deuterogynous, Eriophyid (mite) often used as a biological control of the noxious weed, ''Chondrilla juncea'' (Rush skeletonweed),〔(''Chondrilla juncea'' ) at (Washington State Noxious Weed Control Board )〕 a highly competitive herbaceous perennial composite found in Europe, Asia, Australia and North America.〔Krantz, G.W. and Ehrensing, D.T. (1990). ‘Deuterogyny in the Skeleton Weed Mite, Aceria Chondrillae (G. Can.) (Acari: Eriophyidae)’, International Journal of Acarology, Vol. 16, No 3, pp 129-133.〕
==Biological Description==
At maturity, mites are yellowish orange in colour, with females ranging from 0.19-0.26 mm in length with the males slightly smaller at, 0.165-0.180 mm.〔Powell G.W., Sturko A., Wikeem B.M., Harris P. (1994). ‘Field Guide to the Biological Control of Weeds in British Columbia’, British Columbia Ministry Forest Research Program Land Management, pp. 55-56.〕 Except for genitalia male and female mites are externally similar. Larvae are smaller than the adults and distinguished by a humpback and exhibit no external gentalia. Eggs are soft, round, 0.04mm in diameter and at first colourless but later light orange. Mite growth and development is dependent on environmental and climatic conditions.〔Caresche, L. A. and Wapshere, A. J. (1974). ‘Biology and host specificity of the Chondrilla gall mite Aceria chondrillae (G. Can.) (Acarina, Eriophyidae)’, Bulletin of Entomological Research, 64, pp 183-192.〕 ''A. chondrillae'' have an average generation cycle of 10 days.〔
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