Abstract
RECENT investigations on the Saskatchewan River1 indicate that DDT associated with suspended solids gave outstanding results in the control of black flies. Black-fly larvæ have been practically eliminated from other streams and rivers by the application of DDT at rates as low as 0.1 p.p.m.2; but the maximum distance of effectiveness was approximately nine miles and some of the treatments were destructive to other aquatic life as well as black-fly larvæ. In contrast with these results, during 1948–51 larvæ of Simulium arcticumMall. were largely eradicated from sections of the Saskatchewan River for as long as 98 miles by single applications of DDT. The DDT was applied at rates as low as 0.09 p.p.m. for 16 min. as a 10 per cent solution in methylated naphthalene and kerosene.
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References
Fredeen, F. J. H., Arnason, A. P., Berck, B., and Rempel, J. G. (in preparation).
Garnham, P. C. C., and McMahon, J. P., Bull. Ent. Res., 37, 619 (1947). Gjullin, C. M., Cope, A. B., Quisenberry, B. C., and DuChanois, F. R., J. Econ. Ent., 42, 1 (1949). Hocking, B., Twinn, C. R., and McDuffie, W. C., Sci. Agric., 29, 2 (1949). Hocking, B., Sci. Agric., 30, 12 (1950).
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FREDEEN, F., ARNASON, A. & BERCK, B. Adsorption of DDT on Suspended Solids in River Water and its Role in Black-fly Control. Nature 171, 700–701 (1953). https://doi.org/10.1038/171700b0
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DOI: https://doi.org/10.1038/171700b0
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