Tree under the tree to control apple dry rot

Recently, readers of friends have reported that the main apple orchards planted for 30 years have found irregular shapes, wet surfaces, hard skin, often overflowing sticky liquids, shrinking depressions, dark brown, and cracks around the periphery. I do not know is sick. According to the analysis of the situation, the author should be apple dry rot.

Apple dry rot mainly damages apple trees and stems and apple fruits, causing bark rot and rotten fruit. The apple production area has been seriously affected.

There are two symptoms of big tree disease, ulcer type and branch dry type.

Main branch, main branches and more ulcers. At the early stage of disease, the diseased body was dark brown in shape and irregular in shape. The surface was moist, and the diseased skin was hard. It often overflowed from dark brown to dark brown viscous liquid. The disease was distinct from rot disease. The lesions were not rotted to xylem. After the disease department was dehydrated, it shrank and sunken, showing a dark brown color, and the peripheral edge was cracked and easily tilted. Dry rot generally only harms the surface of the bark. The lesions are small and scattered, but they do not pay attention to prevention and treatment. When the disease is severe, many lesions form large swathes. Some of the lesions can also be rotten to the xylem. The vigor is weakened and even caused. Dead tree dead tree.

Branches often appear on thin twigs or lateral branches and auxiliary branches, and the lesions are purple-brown to dark brown. The edges are not obvious. They spread rapidly and reach deep into the xylem, causing the branches to quickly dry and die. The disease is often found in dry or shallow or poorly preserved mountain orchards. Saw the bark of the bark when the disease was stripe, dark brown, hard, hollow and necrosis, and finally cause large branches or dead trees.

Saplings generally begin to develop in the spring after colonization, especially when irregular or oval lesions form on the grafted or trunk, and are dark brown to dark brown. Later, the lesions were sunken and the edges cracked.

Fruits are more severe at maturity or storage, and their symptoms are indistinguishable from rotten fruits caused by ringworm disease.

Control methods

First, cultivate robust tree potential. In the deep turning to improve the soil and fertilizer, and nitrogen, phosphorus, potash fertilizer with topdressing at the same time, the underground pruning, remove the rot root disease. Timely prevention and control of Other diseases and pests, prevention of early defoliation, reasonable pruning and regulation, strict control of the amount of results. The old orchard and the old and weak trees should be updated. In the aspect of watering, attention should be paid to water control in the autumn, summer drainage and watering in spring, which can significantly reduce the incidence and achieve the tree's own disease resistance.

Second, scrape treatment lesions. The trunks of large trees are onset, and the lesions are mostly limited to the surface. When the curettage is done, only the skin can be scraped. Scrape the surface to be smooth and leave no frizz. After shave, apply 3 to 5 bumeido lime sulfur or 2 to 3 times of cibiqing emulsion or 5% microbiological water solution. The scraped skin was burned or buried in time.

Third, the remedy for major illnesses. After the curettage, bridges or feet must be connected in time. The method is to use the shoots sprouted from the lower part of the wound after germination in the spring, or to scion on the lower part of the wound. Cut the upper end of the wound and cut it into a 3 to 4 cm incline, insert it into the cortex where the upper end of the wound is cut with a longitudinal rectangle incision, and then fix it with iron nails. . If there are no branches or sprouts, the thick annual branches that were cut off during the winter cut will be trapped in the shade and will be taken out when the apples are sprouted. The two ends will be beveled and embedded in the upper and lower ports of the wound. The nails are fixed and the interface is finally covered with a slime seal. The high wound is wrapped with plastic cloth, and it is best to use plastic cloth to take some wet mud to keep the humidity outside the interface. Low wounds can be cultured in wet soil. In this way, after two months of survival, after the release of plastic sheeting, etc., and cut off the branches on the interface. The implementation of this law requires the sooner the better.

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