Synergism and Synergists, Review of Synergism Among Halogen-Containing Insecticides and Halogen-Containing Synergists

Sumerford, W. T.

doi:10.1021/jf60026a014

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1957

1991

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Cited by 7 publications

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Studies in selective toxicity. III.—Benzenesulphonanilides as DDT‐synergists

Neeman¹,

Mer

Cwilich

et al. 1957

J Sci Food Agric

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Benzenesulphonanilides with halogen or methyl substituents in the phenyl radicals, with or without N‐alkyl substituents, were assayed as DDT‐synergists against DDT‐resistant houseflies. Contrasting test methods provided a guide to the intrinsic biological activity of the synergists, and to their ‘availability’ for insects by pick‐up from residual deposits and by absorption through the cuticle. The homologous series of N‐n‐alkyl‐4‐chloro‐ and ‐4‐bromo‐benzenesulphon‐4′‐chloro‐anilides were studied. In both series the biological response to topical application of dilute toxicant solutions was highest for the N‐methyl compounds. The ‘availability’ from deposits appeared highest in the intermediate range C4 to C8. In this range the ‘availability’ appeared to oscillate between homologues having an odd number and those having an even number of carbon atoms. The homologues in the medium range showed a high solubility in kerosene. Homologues above C9 showed no biological activity. The possible modes of action and penetration of the benzenesulphonanilide synergists are discussed.

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