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日本柑桔生产中应用的疏果剂,过去以NAA(萘乙酸)为主,一般在柑树盛花期后30天喷洒200～300PPm的疏果效果较好。目前,正在推广新的疏果剂J445(Ethychlozate;Ethyl-5-chloro-l-H-3 indazolyl acetate即IZAA;Figaron)。在温州蜜柑盛花后35～45天(幼果直径20～25毫米)时喷洒100～200PPm,能疏去小果保留大果。如在幼果直径25～30毫米时喷洒67～100PPm,便有提早果皮转色和增加果计含糖量的作用。乙烯也有提早果实着色的作用,但引起过度落叶。赤霉酸在冬季应用能减少一些桔树的花芽分化;施于幼果能促使果实增大,但可能影响品质。一种新的生长延缓剂PP333(氯丁唑,Paclobutrazol)有希望用于控制柑桔树的营养生长。
In the past, NAA (naphthaleneacetic acid) was the main fruitless agent used in citrus production in Japan. Generally, the fruit thinning effect of spraying 200 ~ 300PPm on the 30th day after citrus flowering was good. At present, the new agent R445 (Ethychlozate; Ethyl-5-chloro-l-H-3 indazolyl acetate; IZAA; Figaron) is being promoted. Satsuma in Wenzhou after 35 to 45 days full bloom (young fruit diameter 20 to 25 mm) when sprayed 100 ~ 200PPm, can be sparse to small fruit to retain large fruit. If the young fruit diameter of 25 to 30 mm when sprayed with 67 ~ 100PPm, there will be early skin color and increase fruit sugar content of the role. Ethylene also has a role of early fruit coloring, but causes excessive deciduousness. Application of gibberellic acid in winter can reduce the flower bud differentiation of some orange trees; application of young fruit can promote fruit growth, but may affect quality. A new growth retardant PP333 (Paclobutrazol) is promising for controlling the vegetative growth of citrus trees.