Abstract
SUMMARYThe effect of para‐chlorophenoxyacetic acid (PCPA) spray on the chemical composition of boysenberries was investigated. A 100‐ppm spray of PCPA 46 days before harvest produced berries 10‐15% larger and heavier than the control sample. Total yield was 9% higher for the sprayed sample than for the control. The acids, soluble solids, and ascorbic acid contents of the berries varied somewhat with date of harvest and ripeness level. A gas‐liquid chromatographic method was used to determine PCPA as a C14‐labeled methyl ester on a column made of 20% Dow 11 high‐vacuum silicone grease on Chromosorb. The method can detect .05 ppm PCPA in a 100‐g sample. Boysenberry plants sprayed once, 46 days before harvest, showed a residue of 0.09 ppm in the berries, whereas those sprayed twice, at 46 and 33 days before harvest, showed a residue of 0.26 ppm.
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