What is the best medicine for rice seedling blight? Detailed explanation of prevention and control methods

Rice is one of the important food crops in our country. The editor's grandmother likes to plant rice on the cultivated land every spring. When the editor visits grandmother's house during summer vacation, grandmother always goes to spray pesticides on the rice, among which rice seedling blight has been heard of. If rice develops seedling blight, it will lead to reduced yield. So what is the best medicine for rice seedling blight? The prevention and control methods are introduced as follows!

I. Introduction to rice seedling blight

1. What are the symptoms of rice seedling blight?

(1) During the rice emergence period, the buds and roots rot. It occurs before emergence or just after the seedlings emerge from the soil. The young buds or young roots of the seedlings turn brown, and the diseased buds twist, rot, and die.

(2) Rotting of rice seedlings at the standing needle stage mostly occurs from the standing needle stage to the 2-leaf stage. The heart leaves of the diseased seedlings turn yellow and withered, the leaves do not unfold, and they occur and die in patches.

(3) Yellow blight and green blight occur at the rice seedling stage, around the 2.5-leaf stage of the seedlings. The leaf tips of the diseased seedlings do not exude water, and the leaves become withered yellow and wilted.

2. What are the causes of rice seedling blight?

(1) Low temperature, cloudy and rainy weather, and insufficient light are important conditions that induce seedling blight, among which low temperature has the greatest impact.

(2) When the temperature is too low, it has little effect on the development and infection of pathogenic bacteria, but it is unfavorable to seedling growth, causes poor root development, and reduces the ability to absorb nutrients, which further helps the disease develop.

(3) If the weather continues to be low temperature or suddenly clears after cloudy and rainy weather, soil moisture is insufficient, the physiology of the seedlings is disrupted, and the occurrence of the disease worsens.

II. What is the best medicine for rice seedling blight?

If rice is found to have seedling blight disease, be sure not to delay treatment, otherwise it will not only affect growth, but also bring reduced yield to that year's rice. The main medicinal treatments are as follows;

1. Spray hymexazol 1200-1500 times diluted solution. After spraying, it can not only disinfect the soil, but also promote plant growth. After being directly absorbed by plant roots, it enters the plant body. It moves within the root system to the stem in only 3 hours, and moves to the whole plant in 24 hours. It also has the effect of promoting crop root growth and development, rooting, strengthening seedlings, and increasing the survival rate.

2. Spray metalaxyl-hymexazol on the leaves after diluting 1500-2000 times. The efficacy is absorbed by the soil, absorbed through the roots, can move to the leaf margins, and take effect, and the efficacy is long-lasting. It enhances rooting ability and improves the yield and quality of agricultural products.

III. Introduction to prevention and control methods for rice seedling blight!

1. Before planting, seeds need to be carefully selected and sun-dried. Only in this way can the germination acceleration technique be improved, the seeds be prevented from being injured, and the vitality and disease resistance of the seeds be improved.

2. Sow at the right time. Sowing should be carried out when the temperature steadily passes above 6 degrees. Do not blindly sow early.

3. The sowing density should not be too large. A sowing density of 0.6 jin per square meter is the most suitable. However, in actual production, farmers often increase the sowing rate in order to save production costs such as agricultural film, as well as considering the emergence rate and the use of rice transplanters. Doing so is incorrect.

4. For seedbed management, do a good job in the work of cold protection, heat preservation, ventilation, and seedling hardening, improve seedling disease resistance, and prevent and reduce the occurrence of seedling blight and bakanae disease.

5. Strengthen field management, do a good job in the links of cold protection, heat preservation, ventilation, and seedling hardening, and achieve early preservation (heat preservation before emergence), middle control (temperature control from after emergence to the 3-leaf stage), and later hardening (temperature adjustment from the 3-leaf stage to before transplanting). Advocate sparse transplanting and early seedling raising, and control temperature and humidity to prevent excessive growth.

By doing the above 5 points well, rice seedling blight can be effectively prevented.

Summary: The above content is an introduction to the medication and prevention and control methods for rice seedling blight, hoping to help friends in need. This article is synthesized from relevant professional knowledge.