How to prevent rice seedling rot caused by rice seedling death

The phenomenon of rotten rice seedlings is common, which is caused by pathogen infection or the influence of non-pathogens. It can be divided into two types: infectious and physiological, physiological rotten seedlings are mainly caused by bad environment, while infectious rotten seedlings are caused by Pythium, Fusarium oxysporum, Fusarium oxysporum and so on.

Rotten rice seedlings

Symptom

There are many causes and symptoms of rotten rice seedlings. Rotten rice seed means that after sowing, the seed embryo becomes black, smelly, and even rotten. Rotten bud means that the rice bud after sowing dies if it fails to turn green. Physiological rotten seedlings are commonly seen as silt seed, dew seed, black root and inverted bud and so on. The damaged part of young buds of infected rotten rice seedlings caused by cotton rot fungus was milky white colloid at first, then changed into radial white, and finally turned into yellow woolly, commonly known as "bayberry". Fusarium wilt is infected by Fusarium oxysporum. White mycelium grows at the center of root and bud base, which quickly causes buds and roots to turn brown, twist, rot, also known as "bud rot", and pink mildew grows in the later stage. Rotten seeds are mainly caused by moisture during seed storage, poor seed disinfection methods or improper control of temperature and water during germination. Physiological rotten seedlings are mainly caused by poor operation quality of seedling field, improper management of sprouting, sowing and water slurry, or reducing toxic substances produced by unfavorable environment and too much immature organic matter in soil.

Prevention and cure

Agriculture is the main way to prevent and control rotten rice seedlings. We should pay close attention to the quality of seed soaking, sprouting and sowing, and at the same time, we should also emphasize the quality of soil preparation of rice seedling fields, apply fully mature organic fertilizer, apply fertilizer scientifically and use water. Infectious rotten seedlings should be sprayed in time when there are no water droplets and sporadic rolled leaves at the leaf tip of rice seedlings from one leaf to three leaves. It can be irrigated with 700 times of 50% dimethazone wettable powder or 30% of 500 times of Likujing 1000 times. If the condition is more serious, the concentration of the solution can be increased appropriately.