Toxicity of 2,4-D to Millipeds (Polydesmidae: Diplopoda): Food Contamination and Residue Distribution as Factors

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Abstract
Adult millipeds, Scytonotus simplex Chamberlin (polydesmidae: Diplopoda), suffered greatest mortality on fully treated substrates; mortality was less when they were exposed only to contaminated food and least when they were exposed to a substrate half of which was treated with twice the dosage of the fully treated substrate. In contrast to controls, mortality of those on fully treated substrate began on the first day and surpassed 50% by day 7. The implications of these results for laboratory biossay and field experiments are discussed.

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