Study On The Occurrence Regularity Of Crown Gall Disease And Prevention Technology Of Cherry

Dizhai Baqiao Xi’an is known as “million mu Cherry Orchard” because of many varieties, widely cultivated area and high yield of cherry. In recent years, cherry industry is expanding. Meanwhile, cherry crown gall is serious and spreading fast in the fields. In addition, orchard management is extensive and defense consciousness of growers is weak. In consequence, a large number of cherry trees are infected with cherry crown gall in Dizhai Baqiao Xi’an. To solve the above problems,the 3 and 10-year-old European sweet cherry(Cerasus avium(L.) Moench) Brooks and Hongdeng seedlings were used to investigate and count the incidence of cherry crown gall. According to Guideline for Safety Application of Pesticides(GB / T8321.1-8321.7), different agricultural fungicides were applied to prevent and cure cherry crown gall in the hope of screening the best agricultural fungicide and appropriate concentration, thus achieving the stable yield and increased production.1. Pathogenesis and occurrence regularity of cherry crown gall were explored through the long-term investigation in Dizhai Baqiao Xi’an. From March to June is the peak of the disease, due to high temperatures that the diseasa is relieved in July, the flow of rubber area and the number of flow is decreased, from August to October, the bacteria is beginning to relapse. Sunburst, Rainier, Hongdeng, Brooks, Sammit, etc based on randomized sampling were investigated in different cherry orchards. Galls number, diameter, color, shape, disease location, gummosis circumstances, pest compound infestation and other conditions of disease trees were observed and recorded. Consequently, field incidence and symptoms of cherry crown gall in Dizhai cherry orchard were statisticed.2. Cherry crown gall disease occurs seriously in Baqiao District, Xi’an. In order to research the technology of this disease control and prevention, the 3 and 10-year-old cherry trees were selected as the test materials, choosing Beibo Rot Invincible, Tree Doctor Ointment, tebuconazole and other 12 kinds of pesticides, using the methods of spraying, abrasion and daubing, the field experiment were conducted.The indicators of gum area ratio, the recurrence rate and cure rate were investigated. The results showed that, when using spraying control method, tebuconazole 4000 times, Tree Doctor Ointment 35 times, 72% streptomycin sulfate 1000 times and 3% Zhongshengmycin 700 times + 70% Thiophanate-methyl 900 times, the cure rate of each was significantly higher than the controland other treatments and combinations, and the cure rate reached to 82.3%, 75.6%, 64.3% and 41.9% respectively. When using abrasion and daubing, Tree Doctor Ointment 85% chemical hydrogen uric acid wettable powder 100 times and Beibo Rot Invincible, the proportion of gum area was much lower than other treatments(P<0.05), reached to 26.4%, 37.8%, 41.3% respectively.