Weed research in south-eastern and tropical Australia: report of visit to research centres in September and October 1987

agricultural research auxiliaire de lutte biologique biological control organisms calotropis carduus chondrilla juncea cirsium escarda mimosa opuntia parkinsonia parkinsonia aculeata polygonaceae prosopis recherche research rubus rumex salvinia senecio senecio jacobaea silybum weed control ziziphus ziziphus mauritiana