Abstract
SUMMARYVarious strains of Puccinia chondrillina, the Chondrilla rust, were collected during surveys in the Mediterranean, undertaken to discover biological control agents suitable for use in Australia against skeleton weed, Chondrilla juncea. Only the strain collected at Vieste (S.E. Italy) was highly virulent against the common Australian form of C. juncea. The specificity of this strain of the rust was tested by inoculation of many unrelated cultivated plants, related cultivated plants and closely related wild plants; all were immune to the rust. These tests satisfied the Australian plant quarantine authorities and this strain of the rust has now been introduced into Australia as a biological control agent for C. juncea.
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