Peach tree root cancer prevention
At ancient times, people picked up wild fruits, and they found the magic of Goji , The pictograph word "qi" in Chinese character just like a man knelt down at a Goji tree , the left of the character "qi" seems like a tree, and the right like a person bowed down. That means as early as four thousand years ago, people found that Goji can keep fit and role of longevity ,Goji has magic power to people`s life.
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First, the pathogenic morphology of the root cancer bacteria morphology is simple, short rod-shaped, small size 0.8mm (1 ~ 1.5) mm3mm, can swim, with 1 to 4 weeks flagella. Gram negative reaction.
Second, the disease symptoms According to field surveys, the entire growth process of peach trees can suffer from root cancer infection, and the location and degree of damage are different. Diseases on the roots and shoots of seedlings and young trees are often heavier than adult trees, but their losses are relatively small. For example, in the past few years, a large number of root cancer diseases occurred after the planting of peach seedlings and cherry seedlings in Wangmatai Village, Pinggu District, and Xishan Farm in Haidian District, Beijing. As decisive measures were taken at that time, they were timely burned and replanted to avoid subsequent Greater economic loss. The three types of common fields are described below.
Rhizome cancer type This is a typical symptom and occurs in large numbers, accounting for 95% of the total survey. The disease occurs in the key rhizome joints of peach trees, directly affecting the normal absorption and transportation of nutrients and moisture, resulting in poor tree growth. Severe disease can lead to tree death and great loss.
2. Root-cancer diseases occur at the roots of various levels of peach trees. With the distribution of the thickness of the roots, the size of the cancer varies. Severe plants are dwarf, and if root cancer occurs, they can cause death.
3. Stem cancer type disease occurs on the base of seedling stems on the ground, which is improperly handled by agricultural operations. For example, the wounds caused by grafting and temporary planting are prone to cause bacterial infections. Early detection should be promptly removed.
Third, the incidence of the law
1. The source of the initial infection of the disease Through investigation and test, the primary source of infection of peach root disease is soil carrier, and the second is carrier disease.
2. Transmission of Diseases Firstly, seedlings propagate with bacteria, it is the main way to carry out long-distance transmission, and secondly, seed-borne transmission.
3. The relationship between different pH values ​​and the growth of C. jejuni could be grown in the range of 6 to 9 for the test pH value. The pathogenic bacteria could not grow under the acidic conditions of pH 8 and pH 5.5. The bacteria grows in a more alkaline environment. It can be seen from the above that it is not appropriate to traditionally treat soil diseases with alkaline drugs such as lime sulfur.
4. Lethal temperature measured in vivo wild bacteria need 7h, in vitro culture bacteria need 3h.
Fourth, control measures
1. Pharmaceutical treatment wound disease prevention technology: in the base of annual peach seedling stem with bud cutting edge, deep to the xylem, and then smear sodium hypochlorite, gentamicin sulfate, until the liquid evaporates, and then smear live wild bacterium solution, quickly with The plastic banding wound moisturizing and preventing disease is best 90%.
2. Use K84 to treat peach seedlings: seed dressing with 2x K84 solvent and directly sowing in disease-free nursery. The highest control efficiency reached 88.19%.
3. Establish a disease-free nursery stock breeding base, cultivate disease-free strong seedlings, and strictly forbid seedlings in wards and fairs to transfer to disease-free areas, conscientiously do inspection and disinfection of seedling production areas, and prevent diseases from being introduced into new areas.
4. The sporadic minor wards shall take effective measures to prevent the disease from continuing to be introduced. The diseased plants shall be found to remove incineration in a timely manner and thoroughly disinfect the soil around the site of the disease so as to prevent the disease from spreading and spreading.
5. There must be plans for the severe wards, and steps should be taken to rectify and control them, reduce the incidence of disease, reduce the sources of primary infections, strengthen agricultural measures, and change the planting structure. For example, grape is used for many years to control disease development.