DDT has been detected in the milk of cows fed forage crops exposed to the insecticide. DDT, in the form of a wettable powder, was added to raw milk to determine its effect on the methylene blue reduction test. The results indicate that the presence of appreciable quantities of DDT wettable powder materially interfere with the accuracy of the test. Care should be exercised in interpreting reduction tests of milk containing this insecticide.

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Author notes

Stephen J. Millian graduated from Brooklyn College with a B.S. in zoology in 1949 and received his M.S. in bacteriology in 1950. He was an Ohio State University Scholar during the period of 1951–52 and is now a University Fellow 1952–53. His field of interest and specialization is in food microbiology.