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The Influence of Aceria chondrillae on the Growth and Reproductive Capacity of Chondrilla juncea

J. M. Cullen, R. H. Groves and J. F. Alex
Journal of Applied Ecology
Vol. 19, No. 2 (Aug., 1982), pp. 529-537
DOI: 10.2307/2403484
Stable URL: http://www.jstor.org/stable/2403484
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Influence of Aceria chondrillae on the Growth and Reproductive Capacity of Chondrilla juncea
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Abstract

(1) The effects of two levels of infestation by Aceria chondrillae on inflorescence growth and reproductive capacity of Chondrilla juncea were examined in a glasshouse experiment. (2) Significant effects were observed on the gross morphology of the plant, measured as a decrease in primary and secondary stem growth, in the production of basal axillary stems and as an altered stem-leaf morphology. (3) The presence of mites significantly changed the fate of growing points, increasing their mortality and producing large numbers of galls. The number of flowers was severely reduced and root weight and capacity to regenerate rosettes significantly decreased. (4) The results are related to field observations made since the specific introduction of A. chondrillae to Australia in 1971 for the control of C. juncea and to the usefulness of gall formers generally as agents for the biological control of weeds.

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