What medicine is the best for rice blight? Introduction of prevention and control methods!

Rice is one of the most important food crops in our country. Xiaobian's grandmother likes to grow rice on cultivated land at the beginning of spring every year. When she goes to her grandmother's house to play in the summer vacation, her grandmother will spray pesticides for rice, among which she has heard of rice blight. If the occurrence of rice blight will lead to a reduction in yield, then what is the best medicine for rice blight? To introduce the prevention and control methods are as follows!

I. introduction of rice blight

1. What are the symptoms of rice blight?

The main results are as follows: (1) during the emergence of rice seedlings, the bud roots rot, which occurs before emergence or just when the seedlings are unearthed, the young buds or roots of the seedlings turn brown, the diseased buds are twisted and rot and die.

(2) the rot of rice seedlings occurred from the needle-setting stage to the 2-leaf stage, the heart leaves of the diseased seedlings were withered and yellow, the leaves did not expand, and occurred and died in pieces.

(3) the rice seedlings were yellow and green, which occurred around the 2.5 leaf stage of the seedlings. The leaf tip of the diseased seedlings did not spit water, and the leaf color was yellow and wilting.

two。 What are the causes of rice blight?

The main results are as follows: (1) low temperature, overcast and rain and lack of light are important conditions to induce blight, among which low temperature is the most important.

(2) too low temperature has little effect on the development and infection of pathogens, but it is disadvantageous to the growth of seedlings, poor root development and decreased ability to absorb nutrients, which is more conducive to the development of the disease.

(3) if the weather is continuous low temperature or sunny after overcast and rain, the soil moisture is insufficient, the physiological imbalance of seedlings and the disease are aggravated.

Second, what medicine is the best for rice blight?

If rice blight disease is found, it must not be treated in time, otherwise it will not only affect the growth, but also reduce the yield of rice in the same year.

1. Spraying 1200-1500 times of carbendazim can not only disinfect the soil, but also promote plant growth. After it is directly absorbed by the plant roots, it enters the plant body. After moving within the root system for only 3 hours, it moved to the stem and 24 hours to the whole body of the plant. It can promote the growth and development of crop roots and improve the survival rate of rooting seedlings.

two。 Metalaxyl was sprayed with 1500-2000 times dilution on the leaf surface, the effect was absorbed by the soil, absorbed by the root, could be transferred to the leaf margin, and played a role, and the effect was lasting. Enhance the rooting ability and improve the output and quality of agricultural products.

Third, the introduction of the control methods of rice blight!

1. Careful seed selection and drying are needed before planting, so as to improve germination technology, prevent seed injury, and improve seed vitality and disease resistance.

two。 Sow seeds at the right time, sow seeds when the temperature is stable above 6 degrees, and do not sow early blindly.

3. The sowing density should not be too large, and the sowing density of 0.6 jin per square meter is the most suitable. However, in the actual production, in order to save the production cost of agricultural film, as well as considering the emergence rate, the use of rice transplanter and other reasons, farmers often increase the sowing rate. It's not right to do that.

4. In the management of seedling bed, it is necessary to do a good job in cold prevention, heat preservation, ventilation and seedling training, so as to improve the disease resistance of seedlings and prevent and reduce the occurrence of blight disease and evil seedling disease.

5. To strengthen field management, it is necessary to do a good job in cold prevention, heat preservation, ventilation and seedling refining, such as pre-protection (heat preservation before emergence), central control (temperature control from 3-leaf stage to 3-leaf stage), post-refining (temperature adjustment from 3-leaf stage to transplanting), sparse planting and early seedling raising, and control of temperature and humidity.

Do a good job of the above 5 points, can be very good to prevent rice blight.

Summary: the above content is about the introduction of the use of drugs and control methods of rice blight, hoping to help small partners in need. This paper is integrated with relevant professional knowledge.