The very scanty information available in literature to indicate the rate at which deposits of DDT disappear either under field or laboratory conditions and lose their toxicity is very contradictory in character. Whereas Fleming (1944) reported that one spraying would be sufficient to prevent attack by Japanese beetle for one season, Gunther (1245), reported that under the climatic conditions of California, DDT deposits lost their toxicity rather quickly. A systematic study on a field scale was made by Gunther (1946), using a variety of preparations and analysing the deposits at intervals. Biological tests also appear to have been carried with the residual deposits but the details were not reported.
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