What is the reason for the delay in tillering of small rice seedlings

1. Rice evil seedling disease:

The law of disease and route of transmission: the pathogen of rice evil seedling disease overwintered on grain and straw, and the diseased seeds or straw were used the following year. The pathogen propagated with the seed germination and invaded from the coleoptile or wound of the seedling, causing the seedling disease to grow. Diseased seedlings often wither and die. The unwithered diseased seedlings are yellowish green, grow slender, generally about 1/3 higher than healthy seedlings, and have poor root development, few tillers, or even no tillers. After transplanting the diseased seedlings, the germs are brought to the field, causing the disease of rice seedlings. When the rice is heading and blooming, the pathogen is transmitted to the flower organ through wind and rain, which makes the grain and straw carry the pathogen and cause cyclic infection to damage the rice. Germs are easy to invade from the wound and sow mechanically damaged rice seeds, or if the roots of the seedlings are seriously injured, the disease will be serious. The disease of dry seedling raising is often more serious than that of water seedling raising.

Control methods: the prevention and control of rice evil seedling disease focuses on the treatment of seeds.

The main results are as follows: (1) choose disease-free seeds to stay. This is the most reliable and effective method.

(2) disinfect the seeds strictly. Soak the seeds with strong chlorine, 100 grams of 50% carbendazim, 50 kg of water, or 120 grams of 35% chlorpromazine, 50 kg of water, or 3% of raw lime water for 48 hours. We must pay attention to that the liquid level must be 15cm-20cm higher than the seed level for seed absorption. At the same time, in the process of seed soaking, the liquid level of the drug remains static, and it can not be stirred or reused to ensure that the bacteria are suffocated.

(3) No matter in the seedling field or in the field, the diseased plants should be pulled out in time to prevent the expansion of infection.

(4) to properly handle diseased straw, it should not be thrown casually, nor should it be stacked on the edge of the field, nor should it be used as a covering for seed germination, nor can it be used to tie up seedling handles. it can be piled up at high temperature and burned seriously with fire.