论文部分内容阅读
一、病原及发生规律: 苹果粗皮病病菌属于半知菌亚门,寄生范围很广,以苹果及梨树上常见,病菌主要在枝干病斑中越冬,可存活13年左右,每年7—8月靠风雨传播,从皮孔侵入,老弱树及弱枝发病重。二、防治对策: 对枝干发病的,要加强管理,壮树防病,及时刮除病斑,减少病菌来源。对果实发病的,要适当喷药,防止病菌侵染。 1、合理施肥:按比例施用氮磷钾和微肥,不要偏施过多的氮肥,更不能不施肥,(即N:P:K=0.7:0.3:0.7),在苹果秋梢基本停长期根外喷施2—3次0.3—0.5%尿素+
First, the pathogen and the occurrence of law: Apple skin disease bacteria belonging to the semi-known bacteria subfamily, parasitic range is very wide, common in apple and pear, the bacteria mainly in the branches of the disease spot in winter, can survive for about 13 years, 7- August spread by wind and rain, penetrated from leprosy, old and weak trees and weak branches of severe illness. Second, prevention and control measures: the incidence of branches, to strengthen management, strong tree disease prevention, curettage lesions in a timely manner to reduce the source of germs. On the incidence of fruit, should be appropriate spraying, to prevent bacteria infection. 1, a reasonable fertilization: the proportion of nitrogen, phosphorus and potassium fertilizers and fertilizer, not partial too much nitrogen fertilizer, but not without fertilizer, (ie N: P: K = 0.7: 0.3: 0.7) 2-3 times outside the root spraying 0.3-0.5% urea +