How to control rice bacterial wilt

Late single-season rice often has premature failure and blue and dry in the late growth stage, affecting normal rice grouting. Rice blight can be divided into physiological bluespot and pathological blight according to the causes. Pathological bluespots are based on pathogens such as bacterial wilt, bacterial wilt and bacterial wilt, and physiological blue and dry temperatures. Rice poor resistance, rice varieties and other factors.

I. Several types and symptoms of rice bacterial wilt

1. Physiological blueberry mainly occurs in the late rice filling stage. The diseased plant leaves are wilting and involute. The symptoms are typical of dehydration. The leaves and husk are gray-gray, like the green rice that has been cut down and spread for 1 day, and the basal stem is shrinking. No spots, easy lodging. The onset of the disease is rapid, and there is no abnormality in pre-morbid diseases and healthy strains, which often occur in large areas within 1 to 2 days.

2. Occurrence of sclerotia sclerotiorum often occurs in the field, and there is also a disease in several strains. The basal tissues of rice plants are soft rot and have dark brown spots. The most recognizable feature is the peeling of the base leaf sheaths and stalks. There are many black sclerotia that are smaller than leek seed.

3. Bacterial base rot Occurrence of sporadic occurrence in the field, 1 in 3 of the 1 strains of the disease, the disease plant was gray rotting rats. Features: Peel off base stalk, filled with stinky water, sterile core.

Second, the cause of rice physiological drough rice paddy is mainly flooded for a long time, rice root activity is poor, water absorption capacity decreased, in the case of sunny and dry hot wind, leaf transpiration, water supply and demand imbalance, water loss caused a serious area Blue and dry. For long-term deep-water irrigation in the earlier period, the land with shallow roots was heavy, the soil was shallow, the nitrogen fertilizer was too heavy, the plots lacking organic fertilizer and potash fertilizer, or the nitrogen application too late were also prone to blue-green. . At the same time, due to species-borne diseases and premature defoliation of rice caused by post-cutting water in the late period of bacteria such as Pediococcus rot, base rot, etc. can also cause premature aging, aggravating the occurrence of bacterial wilt.

Third, the prevention measures will appear to be irreversible if symptoms occur. For fields that are not diseased, water slurry management in the field should be strengthened, appropriate preventive measures should be taken to delay premature senility, increase production, and improve rice quality.

1. Strengthen the management of water slurry, do a good job of early cropping, promote the development of roots, dry and wet in later stages, and prevent premature water cut off. Generally, it is advisable to keep the wet surface till the rice yellow ripe stage.

2, rational fertilizer management, reduce the amount of nitrogen fertilizer, increase phosphorus and potassium fertilizer. The compound fertilizer was added in the early stage and the foliar fertilizer was applied in the later stage to maintain the root activity and increase the resilience of the rice plant.

Colloidal Analyzer

Colloidal Analyzer,Colloidal Gold Virus Test,Colloidal Gold Rapid Test Kit,Immune Colloidal Gold Analyzer

ZSL MED , https://www.zslmed.com