In recent days, bacterial stripe disease in rice areas such as Jiangsu and Anhui has been seriously affected. It is said that many pesticides related to fungicides have been sold out. In view of the fact that many growers and farmers have little understanding of rice bacterial leaf streak, dark horses In this article, Jun will systematically introduce the conditions for the development of bacterial stripe disease and related prevention and control measures.
What is the disease of rice bacterial leaf streak?
Rice bacterial leaf streak is a quarantine bacterial disease. The disease has certain epidemic and fulminant. It has been severe in the southern rice area of ​​China and the rice area of ​​Southeast Asia. In recent years, Jiangsu, Anhui and other places have occasionally occurred, but This year's large-scale occurrence is still rare. Rice bacterial leaf streak will cause rice to reduce production by 10%-20%, and severe areas may reduce yield by more than 50%. Rice bacterial stripe disease is more than japonica rice, hybrid rice. There are more occurrences.
Rice bacterial leaf streak occurs in rice leaves, which is characterized by the formation of streaks on leaves, which may be confused with bacterial blight or rice blight, but a typical feature of bacterial streak is that it can be seen on leaves. To the brownish yellow pus, the leaves are observed against the sunlight, and we can see the transparent strips.
Conditions for occurrence of bacterial leaf streak in rice
Some growers pointed out that “stalk returning to the field†is one of the causes of bacterial leaf streak in rice. In fact, this argument still has some truth. Rice bacterial leaf streak is mainly spread by wintering of seeds and residual straw in the field. Wet weather is an important condition for bacterial leaf streak in rice. When the temperature is between 28-30 degrees, it is easy to occur in a large area after typhoon or storm. It is generally prevalent in June-September. It is the occurrence of rice from the booting stage to the heading stage. As rain and wind spread through the wounds, relevant studies have shown that the application of excessive nitrogen fertilizer or the application of nitrogen fertilizer too late is more likely to occur, and the resistance between the varieties is also different. Research on the resistance mechanism of spot disease and made some progress.
Key measures for prevention and treatment of bacterial leaf streak in rice
Preventive treatment is important: before sowing, the seeds can be soaked for 12 hours and disinfected with strong chlorine. In the application of fertilizers, pay attention to balanced fertilization and avoid excessive application of nitrogen fertilizer. In particular, many growers often choose to apply a large amount of urea in the later stage in order to save the time of early cultivation. This will not only cause late maturity in rice, but also cause rice blast in rice. , sheath blight, rice bacterial stripe disease occurs. For areas where bacterial leaf streak disease has occurred in rice, it is recommended that the straw be collected away from the paddy field after harvesting.
The disease treatment method has occurred: timely application of the medicine, spraying the disease first, and then spraying the affected field, so that the advantage of application is to avoid bringing the bacteria to the uninfected area when applying the medicine, and strengthen the field water management. To avoid the spread of germs by leeches.
At present, there are limited agents for controlling rice bacterial leaf streak. Generally, antibiotic fungicides + copper preparations are used to protect the treatment. Currently, commonly used antibiotic fungicides are spring serotonin and neutrophin, and copper preparations include basic copper sulphate and thiophene. Copper, thiabium copper, etc., other components include thiazolone, zinc thiazole, trichloroisocyanuric acid, chlorobromoisocyanuric acid. Today, some farmers have told us that the use of erythromycin has been ineffective. We recommend that the drug be used in combination with the drug. It should be used once every 5-7 days after the first application. It is not recommended to use agricultural streptomycin because of the agricultural chain. Mycin has been banned.
More pesticide encyclopedia, please pay attention to China Pesticide Network
(Source: Good Agricultural Resources Network)
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