Effect of SADH and Ethephon on Peach Fruit Growth and Maturation1

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Abstract
Applications of (2-chloroethyl)phosphonic acid (ethephon) to peach trees (Prunus persica(L.) Batsch) prior to the completion of pit hardening (stage II) resulted in the early onset of the final fruit swell (stage III) and hastened fruit maturity. Applications during stage I (initial swell) were ineffective. Succinic acid-2,2-dimethylhydrazide (SADH) applications made prior to the completion of stage II resulted in early fruit maturation. Ethephon and SADH in combination during stage II or in successive applications (SADH in stage I and ethephon in stage II) were more effective in the promotion of early fruit maturity than either material alone.

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