A Method for Determination of Oil-Spray Residue on Citrus Foliage1

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Abstract
A rapid and simplified method for the determination of the oil-depositing properties of oil sprays has recently been described (Ebeling 1940). This method involved the spraying of the upper surfaces of large citrus leaves by means of a laboratory precision sprayer, from a distance of 3.5 feet, the leaves being held in place against a metal plate by means of a steel spring clamp. The spray was applied at 450 pounds pressure, with a three sixty-fourth-inch disk in the nozzle. Each leaf was exposed to the spray for 5 seconds, and 50 leaves were sprayed in each test lot. After the leaves were sprayed, they were fastened to Celotex boards with thumbtacks and were dried for a period of 2 to 4 hours in a cool basement with the aid of an electric fan. The portions of the leaves which had been held by the clamp during the spraying operation were then cut off, and the oil was removed from the remaining portions by washing with petroleum ether. After the washings were filtered, the ether was evaporated and the oil was weighed.

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