The prevention and control technology of apple rot is explained in detail!

Apple tree rot is one of the more serious diseases in apple producing areas in China. In northern China, the incidence of apple rot is very serious, with numerous scars and incomplete branches, often causing dead trees and destroying gardens. In recent years, there is a trend of aggravation. Let's take a look at the prevention and control techniques of apple rot.

I. conditions for the occurrence of apple tree rot

Extensive cultivation and management and freezing injury are the main causes of the epidemic of rot disease, such as low soil organic matter, soil consolidation or poor water and fertility conservation, poor root growth, insufficient compound fertilizer, partial application of nitrogen fertilizer, too much fruit, serious year, early defoliation and so on. The disease is more serious in orchards with weak tree potential, and vice versa. In the late low-lying orchard, the water accumulation time is too long, the dormancy period is delayed, and the orchard is vulnerable to frost damage, the disease is also serious, periodic frostbite in the north, resulting in a large area of bark frostbite is an important reason for the large-scale epidemic of rot.

2. Control techniques of apple tree rot

1. Strengthen cultivation management

Strong trees resist disease, prune reasonably, adjust tree potential, adjust tree load, overcome the phenomenon of big and small years, increase organic fertilizer, reasonably match nitrogen, phosphorus, potash fertilizer and medium and trace elements, protect fruit trees from cold, reduce freezing wounds, whitening fruit trees, commonly use whitening agent, lime: salt: water: animal oil (10: 1: 30: 35: 0.2), usually after fruit trees are defoliated, drying height is 2m.

two。 Clean the orchard in time

Timely cleaning of orchards can reduce germs, scrape off diseased spots in time, remove diseased branches, stumps and diseased fruit tables when pruning, remove and burn diseased branches and dead trees in time, and seal saws and other wounds with chemicals or paint. reduce pathogens infection.

3. Use of medicament prevention

Fungicides were sprayed before tree germination in early spring, including 500-fold solution of Gerun or Schenanin water agent, 3-5-degree stone sulfur mixture, 500-fold solution of 5% bacteriological clear water agent, and so on. The above agents can be used to brush the big branches of the tree from June to July, and the control has obvious effect for several years in a row.

4. Be treated with scar

Curettage method: around the scar, 0.5cm cuts a protective ring as deep as xylem with a knife, then scrapes off the diseased skin and healthy skin thoroughly, scrapes off the diseased tissue on the plastic sheet and burns it centrally, and smears the exposed xylem after deep cutting 1~1.5cm with a knife, which can be smeared with 5 times of Grun solution and 5 times of bacteriological water cleaning agent, and then applied again 20 days after treatment.

Mud application method: make mud cake with water and mud, apply to the scar and its periphery 5-8cm, thick 3-4cm, and then fasten it with plastic sheet or Kraft paper. This method should be carried out in spring, remove the bandage in the following spring, and apply disinfection protection after removing the diseased and residual tissue.

Foot connection: the use of foot connection (or bridge) can improve the transport capacity of the tree to nutrition and water, which is conducive to the restoration of tree potential, and can prolong the fruiting life. This method is widely used in the old fruit area, and the new fruit area can be actively promoted.

The above is the introduction of the prevention and control technology of apple tree rot disease by soil flow network. the occurrence of apple tree rot disease is closely related to tree potential, wound number, callus ability and so on. Extensive management and periodic freezing injury are the main epidemic factors.