How to control pests and diseases when planting rice?

During rice seedling raising, the incidence of cotton diseases is relatively high. Especially after sowing, the bud seeds are about to germinate, which is the high incidence period of cotton diseases. The main cause of facial disease is that the humidity of seedbed is too high, which leads to the widespread spread, reproduction and infection of germs and the formation of a large number of cotton-like hyphae on the mother plant. Slight occurrence has little effect on seedbed seedling raising, but once it occurs in a large area, it will affect the seedling emergence rate of seedbed and cause certain losses. Generally speaking, the prevention and control of cotton diseases are mainly water regulation and chemical control. Before germination, if the humidity of seedbed is too high, film ventilation can be used to reduce and alleviate the humidity of seedbed, and chemicals such as "Ximiaotang" and "hymexazol" can also be sprayed for sterilization.

Bacterial wilt is not a disease, but irreversible cell damage caused by dehydration of mother cells. In addition, bacterial wilt is not caused by bacteria, but by the rapid temperature rise in the barn, the transpiration intensity of seedling leaves exceeds the absorption intensity of roots and the loss caused by cell dehydration. The application of fungicides did not improve the effect. The prevention of bacterial wilt is mainly prevention, not treatment. Under what circumstances do bacteria wither most? Long-term low temperature over-photography weather suddenly appears short-term sunny. Due to low temperature shooting, most farmers are used to afforestation with plastic film insulation and poor ventilation. Suddenly it cleared up and the temperature in the warehouse suddenly rose, but the temperature of the seedbed was still very low. The absorption capacity of roots can not meet the transpiration loss of leaves at low temperature, which leads to cell dehydration and bacterial wilt. Therefore, there is only one way to prevent storage diseases, that is, in the long-term low-temperature and low-light weather, we must insist on ventilation to prevent the temperature in the warehouse from rising suddenly, thus preventing the diseases that can't be cold at high places.

Management should be strengthened in rice seedbed stage. For example, ventilation can train seedlings. Especially if the surrounding environment is very low, put curtains or plastic films in the mother temple at night. The purpose of this is to keep the temperature and make it grow better. If a certain humidity of rice is too high, ditches can be dug around it to drain water, and if the water level decreases, the incidence value can be reduced. But if the illness is serious, it is necessary to pour water in time to prevent the illness from getting worse.

Huang Ma's disease in rice usually occurs at the seedling stage of rice with about four leaves. At this time, if the leaves have this disease, the tip of the leaf will not spit water normally, and the color will turn yellow and look very shallow. After the disease turns into blood, it will spread rapidly outward, and the seedlings will wither easily under the sunlight, and the whole seedlings will wither behind.