Heap, J.W. 1990 . Proceedings of the 9th Australian Weeds Conference. Council of the Australian Weed Science Societies Adelaid, Australia xix + 564 pp.

Notes: [Conference held in Adelaide, South Australia from 6-10 Aug. 1990.] This proceedings contains >140 papers and abstracts of posters presented at the 9th Australian weeds conference. Material is categorized under the following headings: weeds in pastures, rangelands, forestry, horticulture, agronomic crops, national parks and aquatic, conservation and amenity areas; extension, regulation and research techniques; herbicide resistance in weeds; herbicide technology; biology, ecology and biological control of weeds. One paper, The effect of biological control agents on weedy cacti in Western Australia, contains information on Dactylopius opuntiae (Coyle).