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Recent interest in certain vinyl and chlorovinyl phosphates for possible use as insecticides has centered on the possible use of dimethyl 2,2-dichlorovinyl phosphate (DDVP) in Hawaii to control the oriental fruit fly and melon fly. The enzymatic method, now in use for estimating residues of demeton, has been modified for the determination of DDVP on subtropical fruits such as pineapple, guava, mango, avocado, and citrus. Residue determinations were also run on Lima bean plants, coleus, and geranium. The modified method consists in extraction of DDVP from plant residues with chloroform, evaporation of the extract in the presence of 20y0 aqueous alcohol solution, adjustment to pH 7, and measurement of the DDVP by its enzyme inhibition, This method, which is sensitive to 0.5 y of DDVP, showed that DDVP residues virtually disappeared after 72 hours. METHYL 2,2-DICHLOROVINYL PHOS-