Abstract
Two varieties of apple trees received several spray applications of a highly refined lubricating oil during the months of July and August. No injury to foliage or fruit was observed from these late sprays. The leaves on these trees were darker green, appeared more vigorous, and exhibited a later leaf drop than those of either unsprayed trees or trees which received other sprays. Chemical analysis disclosed the fact that the oil sprayed leaves of both varieties contained appreciably more chlorophyll than did the leaves from the unsprayed trees.
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