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By R. Pal (auth.), R. Pal, R. H. Wharton (eds.)

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Promecarb (carbamult), which was shown by Roulston et al. (197l) to be fairly effective against Biarra, and subsequently against ticks of the Mt. J. Roulston, unpublished data) is one which may be developed as a commercial acaricide. Fortunately resistance is not universal. High-level resistance of the Biarra or Mt. Alford types is very common in southern Queensland, but rare in coastal areas of central or northern Queensland, whereas in the western interior of Queensland, the Northern Territory and Western Australia, there is no evidence of resistance (Figure 2).

Decline of the resistance levels in the spring in areas where resistance was high the previous season indicates susceptible flies have moved into the treated area. Individual flies will easily move from one to five miles and we have observed a fly marked with a coloured dye which was captured a mile from the release point within an hour. We need to watch for changed biology as new strains appear and alter present controls or invent new ones accordingly. Whether residual insecticides, chemosterilants, juvenile hormones, baits, or space sprays are to be used, the limitation of chemicals in favour of other means of control seems desirable, both because of environmental contamination and because of resistance to pesticides.

Et al. , pp. E. C. (1970) Studies on the population dynamics of the housefly, Musca domestica, Bull. S. (1951) The housefly, Comstock Pub. Co. , 584 pp. , Ganapathipillai, A. and Jabaratnam, G. (1962) Housefly populations and their dispersion in Malaya with particular reference to the fly problem in the Cameron Highlands, Med. J. J. L. E. J. (1971) Insect control by genetic manipulation of natural populations, Science, 171, 682-684 J. Keiding 30 WHO (1970) Insecticide resistance and vector control, 17th Rep.

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