Fruit thinning

Japanese: 摘果 - てきか（英語表記）fruit thinning

In fruit horticulture, thinning out young fruits is done when there are too many fruits or they are unevenly distributed in certain areas. The purpose is to regulate the competition for water and nutrients among the fruits and between the fruits and new shoots, thereby promoting fruit growth and maintaining tree vigor. This is generally done about one month after flowering, taking into consideration the relationship between fruit growth, quality, and leaf number. To do this, peaches are picked with fingers, and pears, apples, grapes, persimmons, etc. are thinned using scissors. Recently, a labor-saving method of thinning the fruits by spraying a low-concentration solution of a plant hormone such as indoleacetic acid or naphthaleneacetic acid (sodium or potassium salt) has come into practical use.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

果樹園芸で結実が多すぎたり，局部にかたよっていたりするとき，幼果の間引きを行うこと。その目的は養水分に対する果実相互，果実と新梢との間の競合を調節して，果実の発育と樹勢の維持をはかることである。一般に開花後1ヵ月ぐらいたった頃，果実の生長，品質と葉数の関係を十分に考慮して行う。方法は桃などは指で摘み，なし，りんご，ぶどう，かきなどは鋏を使う。最近はインドール酢酸，ナフタレン酢酸 (ソーダ塩またはカリウム塩) などの植物ホルモン剤の低濃度液を散布して摘果する省力方法が実用化してきている。

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