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Apples and pears from trees in several experiments in various sections of the U.S., sprayed with Plictran miticide, were analyzed for residues of total and organic tin. Inorganic tin was calculated as the difference between total and organic tin. Residue levels were similar on the two fruits and a maximum of less than 2 ppm of organotin was found, calculated as tricyclohexyltin hydroxide (Cy3SnOH) on the day of the last of four applications. Organotin decreased to about half of the initial value in 3 to 5 weeks. Most of the residue of total tin remaining 4 weeks after spraying was organic tin, and most of that was the active ingredient Cy:iSnOH. Nearly all the residue was on the peel of the fruit, and up to half of this was removed with a cold water wash.

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