Abstract
IT has been noted in field trials conducted over a three-year period that nymphs of the sugar-cane frog-hopper (Aeneolamia varia saccharina Distant), derived from populations of the insect which have been resistant to chlorinated hydrocarbons for the past five years, are now once again susceptible to DDT (5 per cent in ground limestone). The unusual toxicity curves, a typical example of which is presented in Fig. 1, are worth mention because they differ from the original toxicity curves for susceptible froghopper nymphs, in which DDT invariably caused a quicker initial kill of nymphs1. A brief description of the procedures used in the experiments will facilitate the interpretation of results.
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References
Blackburn, F. H. B., Trop. Agric., 26, 93 (1949).
Sternburg, James, Kearns, C. W., and Moorefield, H., J. Agric. Food Chem., 2, 1125 (1954).
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VLITOS, A., MERRY, C. Susceptibility to DDT of Previously Resistant Nymphs of the Sugar-cane Froghopper (Aeneolamia varia saccharina Distant). Nature 194, 211–212 (1962). https://doi.org/10.1038/194211a0
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DOI: https://doi.org/10.1038/194211a0
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