Growth Regulators Prolong the Bloom of Oriental Flowering Cherries and Dogwood

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Abstract
Expts. were carried out in 1948 and 1949 in which individual branches or whole young trees of Japanese flowering cherries (Prunus yedoensis and P. serrulata) and white flowering dogwood (Cornus florida) were sprayed with alpha-naphthaleneacetic acid (NAA), beta-naphthoxyacetic acid (NOA), or p-chlorophenoxyacetic acid (CPOA) in concns. of 5, 10. 20, 40, and 80 ppm. Flowering cherries which were sprayed with NAA or NOA kept from 25 to 80% of their blossoms for 3-10 days longer than unsprayed controls; treatment was most effective just as trees came into full bloom, and was ineffective when applied to buds just prior to opening: some injury to foliage was noted with higher but none with lower concns.: NAA was more effective than NOA: and CPOA was ineffective in concns. used. White dogwood was tested with NAA and CPOA; petal-like flower bracts of the dogwood were retained 4-6 days longer in sprayed plants than in controls: CPOA was more effective than NAA, but even in low (5 ppm.) concn. tended to deform leaves. Sprays were tested but found ineffective on the following plants: azalea, aronia, crab apples, flowering quince and almond, redbud, bridal wreath spirea, lilac, and star and saucer magnolia.
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