Methods for Thinning and Preserving Peach Blossoms and Fruit
Regarding peach blossom and fruit thinning, spraying Ethephon at a concentration of 200 mg/kg eight days after flowering, or a Naphthylacetic Acid (NAA) solution at 40–60 mg/kg between 20 and 45 days after flowering, has proven effective. Trials on yellow peaches showed that spraying Ethephon at 300 mg/kg during full bloom yielded excellent thinning results.
Spraying Paclobutrazol (Paclo) at concentrations of 500–1,000 mg/kg during the flowering stage also produces significant thinning effects; by inhibiting pollen germination and early fruit expansion, the treated fruit actually weighed more at maturity than the control group. Spraying Chlorflurenol-methyl (Morphactin B) at 60 mg/kg one week after full bloom on the 'Hakuhou' and 'Okubo' varieties met commercial thinning standards; furthermore, the peak period of fruit drop occurred 2–3 weeks earlier than in the control group, thereby conserving nutrients. This method reduced costs by over 50% compared to manual thinning, allowed for harvesting one week earlier, and significantly increased economic value.
Regarding the preservation of peach blossoms and fruit, fruit set rates can be improved by spraying "Fangluosu" (a blossom/fruit drop inhibitor) at 10–20 mg/kg during flowering; Paclobutrazol (Paclo) at 20 mg/kg after flowering; Gibberellic Acid (GA3) at 1,000 mg/kg 15–20 days after flowering; or "Fangluosu" at 25–400 mg/kg between late April and mid-to-late May.
Spraying Paclobutrazol (Paclo) at concentrations of 500–1,000 mg/kg during the flowering stage also produces significant thinning effects; by inhibiting pollen germination and early fruit expansion, the treated fruit actually weighed more at maturity than the control group. Spraying Chlorflurenol-methyl (Morphactin B) at 60 mg/kg one week after full bloom on the 'Hakuhou' and 'Okubo' varieties met commercial thinning standards; furthermore, the peak period of fruit drop occurred 2–3 weeks earlier than in the control group, thereby conserving nutrients. This method reduced costs by over 50% compared to manual thinning, allowed for harvesting one week earlier, and significantly increased economic value.
Regarding the preservation of peach blossoms and fruit, fruit set rates can be improved by spraying "Fangluosu" (a blossom/fruit drop inhibitor) at 10–20 mg/kg during flowering; Paclobutrazol (Paclo) at 20 mg/kg after flowering; Gibberellic Acid (GA3) at 1,000 mg/kg 15–20 days after flowering; or "Fangluosu" at 25–400 mg/kg between late April and mid-to-late May.
