Control techniques of soybean virus disease

Soybeans are soybeans in the south. Soybeans are extremely prone to virus diseases, and there are many kinds, about a dozen kinds of virus diseases. Virus diseases are mainly transmitted by insects, seeds can also carry viruses, and several virus diseases in the south are transmitted by aphids. Sometimes several viral diseases occur together, what the symptoms are and how to treat them. Let's learn from the chair together.

1. The cause of disease

There are three pathogens, one is caused by soybean mosaic virus, another is caused by cucumber mosaic virus, and the other is caused by alfalfa mosaic virus. These viruses occur at the same time, showing mixed symptoms, mainly in the south. It rarely happens in the north.

2. Manifestation of the disease

Spring disease, the upper leaves mottled green and yellow, flowers and leaves, mesophyll has a bubble-like protruding phenomenon, gradually began to wrinkle, after the leaf deformity, the edge will roll down. As a whole, they begin to get shorter and rarely bear pods, even if they bear abnormal pods. After maturity, the particles of the pods are very small, and brown spots may appear inside.

3. Inducement of the disease

For some high-yielding varieties, disease resistance is more likely to occur than short and strong ones. In dry areas or seasons with little rain, there are many insects, especially aphids, and the disease will be very serious. Plants are vulnerable to infection because of lack of nutrition.

4. Prevention and control methods

It is better to choose a disease-resistant variety such as Liaoxian 1, and the remaining plants should be planted separately, from seeds to soil carefully sterilized. Be the fattest in every period and maintain the supply of soil nutrients. Pay attention to the prevention and control of aphids, do not let aphids harm everywhere, prevent spread. Spray with 20% virus A 500 times, or 1.5% Zhishanling EC 1000 times. Aphids are sprayed with a 500-fold solution of 10% imidacloprid.

The common soybean virus diseases are the above three, which mainly occur in the south. Aphids are the main transmission vector. We must focus on the prevention and control of aphids in order to effectively control the disease. The prevention and treatment of viral diseases should be treated with drugs when the disease is mild.