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‘金冠’苹果盛花后14天喷施1200ppm敌百虫可以引发落果,在短期内抑制幼果的生长。根据幼果在短果枝上的发育与坐果特征的不同,可分为三类:中心果、初生边果和次生边果。~(14)C-敌百虫示踪实验表明,敌百虫在维管束和幼果中含量高。敌百虫喷施48小时后,短果枝莲座叶的光合作用显著地受抑制,同时运向幼果的~(14)C-同化物显著减少,光合作用在8至18天内恢复正常。作者认为,敌百虫疏果的机制是减弱“源”、“库”的强度,加剧短果枝内碳水化合物短暂缺乏,使较小的幼果因碳水化合物缺乏而减缓生长,直至脱落,达到疏果的目的。
Spraying 1200 ppm trichlorfon on the 14th day after the Golden Delicious apple blooms can cause drop fruit and inhibit young fruit growth in the short term. According to the young fruit in the short fruit branch of the development and characteristics of fruit set can be divided into three categories: the central fruit, primary and secondary border fruit. ~ (14) C-trichlorfon tracer experiments show that trichlorfon in vascular bundles and young fruit content is high. After 48 hours of trichlorfon spraying, the photosynthesis of short Prunella rostifolia leaves was significantly inhibited, while the ~ (14) C-assimilate toward young fruits was significantly reduced and photosynthesis returned to normal within 8 to 18 days. The author believes that trichlorfon thinning mechanism is to weaken the “source”, “library” strength, exacerbating the short-term lack of carbohydrate short branches, so that smaller young fruits due to lack of carbohydrate to slow down growth until it falls to sparse The purpose of fruit.