THE year 1939 marked the publication by F. E. Gardner, P. C. Marth and L. P. Batjer of their important discovery that the spraying of synthetic growth-substances on young apples prevented the natural shedding of fruit, which often reduced the crop quite substantially. These findings have been confirmed and expanded by many workers, and Dr. M. C. Vyvyan, of East Mailing, has summarized the large amount' of research which has been done on the subject*.

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DOI

https://doi.org/10.1038/159617a0

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