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pp333(多效唑)是由英国ICI公司发展的一种新型植物生长延缓剂;对果树生长具有很强的抑制效应。近年来英国、美国、澳大利亚等国的果树生产中应用较多,其使用范围也愈来愈广,不限于苹果,对草莓、葡萄、樱桃、李子的应用效应也有许多报导。经专家们研究确认pp333的主要作用是抑制新梢生长,促进树体矮化,提高产量和单果重,对果实的大小和形状没有不利的影响。另外,对个别树种还有疏果的作用。澳大利亚专家Quinlan等人(1983)对重剪后的红元帅系大树施用研究表明,土壤喷布不能抑制枝条生长,叶面低浓度喷布能有效地抑制生长,连续几次喷250ppm的低浓度药液比一次性喷1000ppm的更有效,同时还能提高花序数。Belvubi等对草莓进行不同浓度的叶面喷施发现:pp333对产量没有影响,但大大减少了营养生长。在樱桃和李树土壤施用(1.6克/株)比叶面
pp333 (paclobutrazol) is a new plant growth retardant developed by ICI in the UK. It has a strong inhibitory effect on the growth of fruit trees. In recent years, Britain, the United States, Australia and other countries in the production of fruit trees more applications, its use is also growing, not limited to apples, strawberries, grapes, cherries, plums, application effects have also been many reports. The experts have confirmed that the main role of pp333 is to inhibit shoot growth, promote dwarfing of the tree, increase yield and fruit weight without adversely affecting fruit size and shape. In addition, there are individual species of fruit thinning effect. The Australian expert Quinlan et al. (1983) studied the application of heavy trees after the red shear. The results showed that soil spraying did not inhibit the growth of shoots. The low concentration of foliar spray could effectively restrain the growth. The liquid is more effective than one-time spray of 1000ppm, while increasing the number of inflorescences. Belvubi and other strawberries at different concentrations of foliar spray found: pp333 has no effect on the yield, but greatly reduced vegetative growth. In the cherry and plum soil applications (1.6 g / plant) than the foliage