论文部分内容阅读
近年来,不少果园苹果树出现了不正常落叶,严重影响花芽形成和花芽的饱满度,导致翌年产量大幅度下降。笔者认为苹果生长期早期落叶,归纳起来有以下几个方面的原因. 1.病理性落叶 主要由真菌侵染造成的一类落叶病。多发生在早期。主要有褐斑病、圆斑形、斑点形。发病品种以金帅、红富士较重、乔纳金较轻,红星品种较乔纳金稍重。发病期以6月上中旬为第一高峰,第二高峰期在8月上中旬。以前者较普遍,而且发病快,危害重。此时落叶正值花芽分化初期,导致花芽不能形成;后期落叶,导
In recent years, many orchards of apple trees appear abnormal deciduous, seriously affecting the flower bud formation and flower bud fullness, leading to a substantial decline in the following year. I believe that early apple growing leaves deciduous, summed up the following reasons 1. Pathological deciduous fungal infection caused by a class of deciduous disease. Occurred in the early days. Mainly brown spot, round spot, spot-shaped. The incidence of species to the handsome, red Fuji heavier, lighter Jonathan, red star species slightly heavier than Jonathan. The incidence of the first peak in mid-June, the second peak in mid-August. The former is more common, and the incidence of fast, serious harm. At this time positive deciduous flower bud differentiation, leading to flower buds can not be formed; late deciduous, lead