ISHS Acta Horticulturae 201: Manipulation of Ethylene Responses in Horticulture, XXII IHC
EFFECT OF FALL ETHEPHON AND HAND DEFOLIATION ON DORMANT BUD ETHYLENE LEVELS, BLOOM DELAY, AND YIELD COMPONENTS OF 'REDHAVEN' PEACH |
| Authors: | C.H. Crisosto, P.B. Lombard, L.H. Fuchigami |
| Abstract:
The effect of fall applied ethephon and defoliation on the time of bloom and spring bud break was studied. Fall 1984 application of ethephon at 120 ppm on hand-defoliated and non-defoliated trees delayed bloom by 5 days. Internal ethylene levels in buds during dormancy on ethephon and aminoethoxyvinylglycine (AVG) treated limbs indicated that ethylene levels from ethephon were 66% higher while AVG was 30% lower than untreated limbs. The highest ethylene levels were related to bloom delay. Flower, leaf, and fruit number were not affected by defoliation. However, fall ethephon sprays decreased leaf and flower numbers. Yield efficiency was significantly higher on fall ethephon and hand-defoliated trees than ethephon on foliated trees. | |
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