How to prevent and control black rot of jujube trees, what diseases do jujube trees have, and how to

1) The method of preventing and controlling jujube dry rot is to pay attention to observation, and disinfect the wound after it is found to prevent the invasion of germs.

2) If broken branches are found, immediate measures should be taken to improve the disease resistance of the tree and strengthen fertilizer and water management.

3) After discovering the tree hole, pay attention to curettage, disinfect with 1% formaldehyde, and then seal the wound with cement.

Sukrin spray 2 2 dozen 3 pots.

Brown spot disease. There are black-brown near-circular depressions on the leaves and fruits. Foliar spraying of difenoconazole or zeb or zinc propionate or pyraclostrobin or carbendazim or thiophanate-methyl for control, spraying once every 7 10 days, spraying 2 3 times in a row, can control the disease, and restore the normal growth of diseased plants.

Add potassium dihydrogen phosphate and spray together, the control effect is better. In addition, the diseased plants should strengthen the fertilization management, increase the application of phosphorus and potassium fertilizers and organic fertilizers, so as to promote the strength of the trees and improve the ability to resist diseases.

Jujube mosaic disease is a serious disease second only to jujube madness in northern jujube trees, and it has a tendency to worsen year by year. According to the research of Ma Runnian, a teacher at Shanxi Agricultural University, jujube mosaic disease is a disease caused by mycoplasmid infection. Because mycoplastids are sensitive to tetracycline, the following methods can be used to prevent and control them.

In mid and late April, when the jujube buds begin to germinate, at the base of the main trunk of each diseased tree is 10 15 cm from the ground, two holes with a deep diameter of 2 3 are drilled to the core of the main trunk with a wooden drill, and the two holes are perpendicular to each other. Plug a hole and leave a hole to drip the liquid medicine. 250,000 units of tetracycline hydrochloride are diluted into 1000 4000 milliliters, and 250,000 units are injected into each plant (using the hanging bottle injection infusion method), so that the liquid can slowly penetrate into the trunk.

The jujube tree is crazy, there is no special medicine at present, and it can only be sawed to that crazy, and it is generally not necessary to sawn off the whole plant.

Prevention and control methods: 1. Strengthen the quarantine of the place of origin, and strictly prohibit the entry of jujube mad seedlings into the jujube area.

2. Eradicate diseased trees to prevent infection. Timely and thorough removal of diseased trees to eliminate infection centers at an early stage; When removing diseased trees, the large roots should be removed together to avoid germination. Diseased trees, branches or roots should be burned in time.

3. Water and fertilizer should be increased during the germination and leaf development stage, flowering and fruit setting stage, and fast-growing period of jujube trees, combined with spraying 1 2 times of 300 times urea solution to carry out root topdressing. It can improve the physical and chemical properties of soil, improve soil fertility and enhance tree potential.

4. In the early stage of the disease, drill holes in the rhizomes of diseased trees with a hand-cranked drill, and inject 500 ml of tetracycline solution with a concentration of tetracycline solution into each diseased tree during the budding period of jujube trees in spring or in October.

5. At the initial stage of the disease, the ferric chloride solution sprayed 2 3 times per 667 square meters of jujube orchard, sprayed once every 5 7 days, each time with 75 kg of liquid medicine 100 kg, has a good effect on the prevention of jujube madness.

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