Parthenocarpic fruit in Cox’s Orange Pippin apples, obtained without hormones

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Abstract
Examination of some 1200 open-pollinated fruit during three seasons failed to reveal a single parthenocarpic fruit. However, a low incidence of partheno-carpy was found in unsprayed controls from thinned, decapitated flowers used for hormone experiments. Surprisingly, small untreated control trees covered entirely with muslin to prevent all insect pollination yielded substantial numbers of parthenocarpic fruit. It is suggested that competition from seeded fruit is the most important factor determining the incidence of parthenocarpy.

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