The plague disease is caused by bacterial infection, commonly known as bacterial disease or bad head disease. There are black and dry type and shrunken leaf type. In our mulberry field in Yixing, black wilted type occurs, which is the main mulberry tree. One of the diseases. The disease damages the leaves and shoots, causing the leaves to appear yellow-brown spots, and even the whole piece is withered; at the same time, it causes the black shoots of shoots to rot and rot, so that the shoots cannot continue to grow, which has a great impact on the yield. The specific prevention and control measures are as follows:

I. Agricultural control

Strengthen mulberry garden pest management work to avoid wounds, pick leaves in summer and autumn to keep the handle, prevent rough collection of leaves, damage winter buds, branches, reduce bacteria invasion portal, reduce the incidence rate; scientific fertilization, increase organic fertilizer, nitrogen, phosphorus and potassium Shi, enhance mulberry disease resistance.

Second, the selection of plant resistant varieties

The old mulberry renewal and new extension mulberry gardens can be selected according to local conditions, such as Yu No. 2, Husang No. 199, Husang No. 13, Nongsang No. 8 and other resistant mulberry varieties.

Third, strictly implement quarantine, cultivate healthy seedlings

Sick seedlings and ears must not be transported. The sickness was prevented from being scorched, and the diseased seedlings were immediately burnt and sprayed with 0.6-0.7% Bordeaux mixture to prevent spread.

Fourth, clear the pathogen

In the growing season of mulberry, diseased branches and leaves are found to be cut off in time and brought out of the mulberry garden. The sick branches after the summer fell must be dealt with as soon as possible. In winter, the cutting tip is cut off at three inches below the diseased spot of the diseased branch (there are no yellow-brown in the xylem of the shoot). The mulberry strains that have been on the disease year after year can be dried and cut in the spring.

V. Mulberry pests

We must conscientiously do a good job in mulberry pest control, reduce the number of insect populations, reduce insect damage, and prevent the occurrence of large-scale pests.

Sixth, drug control

To prevent this, focus on the key periods of mid-April, the rainy season, summer and autumn. During the growing season, the diseased shoots were immediately cut off and sprayed with 500 units of oxytetracycline hydrochloride solution or 100 units of agricultural streptomycin solution, spraying once every 7 days, and spraying three times. In the non-silkworm stage, 0.1% copper ammonia solution or 0.1% copper sulfate solution can also be used for control. Spraying once every 7 days and spraying three times can effectively control the occurrence of diseases.

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