The influence of three populations of Aceria chondrillae on three forms of Chondrilla juncea.

Published online
01 Jan 1983
Content type
Journal article
Journal title
Journal of Applied Ecology

Cullen, J. M. & Moore, A. D.

Publication language


The performance of 3 populations of Phytoptus chondrillae G. Can. (Aceria chondrillae), a mite that had been introduced into Australia for the biological control of the weed Chondrilla juncea, was quantified in the glasshouse on forms A, B and C of the food-plant. Form A was the original food-plant for all 3 populations, but while one population had been maintained on form A the other 2 had been maintained on form B, one in the laboratory and one in the field. The original mite population caused extensive gall-formation and reduction of flowering on form A, had a lesser effect on form B and a minor effect on form C. The 2 other populations produced greater effects on both form A and form B than the original population, but attempts to establish one of these on form B in the field in the absence of form A were unsuccessful. These results indicate that the interaction between the mite and its food-plant is very sensitive to changes in growing conditions for the plant. Results pointing to real differences between the 3 populations must therefore be interpreted with caution.

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