A Study of Arsenical Residues on Apples in Pennsylvania With Respect to Efficient Spraying Practices1

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Abstract
Insect species attacking apples in Pennsylvania necessitated six arsenical spray applications. The omission of one or more of these treatments resulted in increased injuries to the fruits. Satisfactory protection was obtained during 1926 without excessive arsenic occurring on the apples at harvest time. Rains in excess of normal tended to reduce the amount of spray deposit. Visibility of materials was no indication of the relative amounts of residual arsenic.