Apple tree rot, commonly known as rotten skin disease, is a devastating disease. The incidence of rot disease in the northern apple production area is serious. The trees are very ill, and the branches are incomplete. They often result in dead trees and destruction of gardens. In recent years, there has been an increase in rot.
First, the symptoms
The rot disease mainly damages the branches, causing the cortex to rot and necrosis, often showing two types of ulcers and branches.
The ulcer type mainly occurred on the trunk and branch, and the main branches and branch branches of the resulting tree were the most. The lesions are round or oval in shape, reddish-brown, water-stained, and gradually become loose and soft. Tawny sap often flows out. Afterwards, the cortex is wet and has distiller's grains. Diseased skin easily peeled, internal organization red-brown. In the latter part of the disease, the dehydration depression was hardened, gray-brown to dark brown, and the diseased and healthy junctions cracked. Black spots on the skin are densely covered with black spots of orange and colloidal spores when wet. In severe cases, the lesions spread around the branches for a week and the branches on the affected parts died of dryness.
Branches often appear in the branches and branches of fruit trees from 2 to 4 years old, fruit vines, and dry piles. The lesions are irregularly shaped, red-brown, and quickly spread around for a week, causing the entire branch to die. The late disease department also showed black small particles. In the debilitating tree, the symptoms of branch blighting are particularly obvious and can cause the main branch or the whole plant to die.
Second, prevention and control measures
1. Strengthen the cultivation and management of Zhuangshu disease resistance, reasonable pruning, adjust the tree vigor; adjust tree load to overcome the phenomenon of size; increase organic fertilizer, a reasonable match with nitrogen, phosphorus, potash fertilizer and trace elements; do a good job of fruit trees to prevent cold and reduce frostbite Mouth, the results of the tree painted white, commonly used whitening agent, lime: salt: water: animal oil 10:1:30-35:0.2, generally in the fruit trees after the defoliation, smear dry height of 2 meters.
2. Clean the orchard to reduce germs, and find that the lesions are promptly scraped; when pruning, remove the diseased branches, stumps, and diseased fruit benches; remove the diseased branches and diseased dead trees and remove the burned ones in time; cut the slash mouth and other wounds with pesticides or paints. Reduce pathogenic infection pathways.
3. Pharmaceutics prevention: spraying bactericide before germination in early spring, the agents are: gerun, Schnering agent 500 times; 3-5 degree lime sulfur agent; 5% bacteriostatic agent 500 times solution. From June to July, the above-mentioned medicaments can be used to brush large branches of trees, and prevention and treatment have obvious effects for several consecutive years.
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