What are the symptoms of big cherry suffering from dry rot? Attached prevention and control technology

Big cherry is a kind of fruit with high nutritional value, and even the high price is deeply loved by consumers. Many people buy big cherries one by one. There are many key points in cherry planting management, and they are also vulnerable to diseases and insect pests. What are the symptoms of dry rot in big cherries? With prevention and control technology.

What are the symptoms of dry rot in big cherries?

Dry rot is mainly caused by black rot shell of drupe, harming the trunk and main branches, causing bark rot (non-epidermis), resulting in dead branches and dead trees. It occurred from early spring to late autumn, especially from April to June, especially in the early stage of fruit hanging. In the initial stage, the cortex of the disease is slightly swollen, slightly purplish red, some will be slightly glue, and finally turn brown and die, with the smell of lees, and small black protruding particles appear on the surface.

The pathogen overwintered in the trunk tissue with mycelia, ascomycetes and conidia, and invaded from the wound and lenticels by means of wind, rain and insects from 3 to 4 years old. The peak period is from April to June, and the high temperature is restrained from July to August, and stops after November. Improper fertilization (uncooked farm manure, chicken manure, pig urine in Dalian) and rainy autumn, low cold resistance of the tree, has caused the disease. This is also the reason why the phenomenon of dead branches is more in the fruiting stage and gradually alleviates after fruiting.

2. Control techniques of dry rot of big cherry

1. Cultivate strong seedlings. The nursery should not be flooded and fertilized, especially not to promote seedlings with quick-acting nitrogen fertilizer, so as to prevent the seedlings from being susceptible to freezing injury.

2. Strong seedlings should be selected and sufficient base fertilizer should be applied when planting. The planting depth should be that the grafting interface is flat on the ground. After planting, irrigation should be timely and management should be strengthened to shorten the slow seedling period as far as possible. When transporting young trees, try to avoid causing wounds and dehydration. Wounds should be disinfected with 1% copper sulfate solution or protected by lead oil to reduce the chance of bacterial infection.

3. Strengthen the management of soil, fertilizer and water. Increase the application of organic fertilizer and turn deeply to improve the soil; improve the conditions of drainage and irrigation so that it can be discharged when irrigating rain during drought; do a good job of tree protection to prevent frost damage; in addition, field management operations should try to avoid a variety of mechanical wounds to prevent diseases.

4. during the dormant period of the fruit garden, combined with pruning and clearing the garden, all kinds of diseased branches, insect branches or dead branches were cut off and destroyed.

5. Curettage the disease spot thoroughly as soon as possible. Curettage as far as possible in the early stage of the disease. March every year is the best time to discover and scrape the branch diseases. If you find the abnormal parts or obvious diseased parts of the branches, they will be cut off with a sharp knife, and disinfected with chemicals and protected for many times. Disinfection or protective agents can be brushed with 3-fold carbine, Shukang original solution, Baume 10-degree stone sulfur mixture, 1% copper sulfate solution or 70% methyl thiophanate wettable powder 100-fold solution, 40% Fumet arsine wettable powder 50-fold solution. The disease is a stubborn disease, some spots can not be cured by scraping a spot and smearing medicine several times, sometimes it needs to be re-curetted, and if necessary, the branches of serious disease should be cut off. The growth period is generally not suitable for scraping, you can first use the above agents to smear the disease, wait for the dormant period and then thoroughly curettage. Generally speaking, the old disease spot can be treated by curettage after winter.