Rational use of drugs to cope with bacterial leaf streak in rice

Q: How can I control rice bacterial leaf streak?

A: Rice bacterial leaf streak is a national phytosanitary disease. The disease has occurred sporadically in Xuzhou, Suqian, Huai'an and other places in recent years, and the area of ​​occurrence is small, mainly occurring in the old ward of japonica rice. The lesions are dark green water-stained translucent small spots at the beginning, and then spread into brown short-striped lesions. When the lesions are many, they can grow streaks. Looking at the sun, transparent long spots can be seen at the veins. The leaves are dead. It can occur from the seedling stage to the heading stage, but it is more common from the end of the tillering stage to the early stage of heading. After the onset, it seriously affects rice filling and increases the amount of mites, causing a decrease in yield. The disease is mainly transmitted by infected seeds and field diseased bodies. After the implementation of seed quarantine, the incidence of disease caused by the seeds is generally less. Field sickness is generally more difficult to handle. It is an effective measure to prevent and treat the disease by treating the seeds before sowing and protecting the rice from infection by the bacteria. Replanting japonica rice with strong disease resistance in the old ward of japonica rice is also beneficial to control the disease.

The drug is used to prevent and treat the disease. When spraying, it is necessary to spray the area that has not been infected, and gradually surround the disease center. The disease center should be relatively heavy. In the prevention and treatment strategy, we must base ourselves on the principles of early treatment and drug protection, and find that one piece is hit and one piece is found. In the field of disease, it is necessary to prohibit cross-irrigation, flood irrigation and the use of circulating water to prevent the spread of disease, and prevent it once every 5 to 7 days after the first prevention to ensure the control effect. Suitable drugs for controlling the disease include thiazolone, zinc thiazole, basic copper sulphate, thidium copper, thiabium copper, acacia copper, neutrophin, trichloroisocyanuric acid, chlorobromoisocyanuric acid, etc. . The effect of drug control in the late stage of the disease will decrease, and the application of fertilizer should be combined with fertilization to promote rice recovery.

Tetazin is a broad-spectrum fungicide with good control against a variety of bacterial and fungal diseases. It can effectively protect plants from pathogens in the early stage of disease occurrence. Increasing the dosage after disease occurrence can obviously control the spread of diseases, thus achieving the dual functions of protection and eradication. The drug is a highly effective drug for controlling bacterial diseases such as bacterial leaf streak, bacterial blight, bacterial base rot, etc. The recommended dosage per hectare is 26.25-37.5 g, which is equivalent to the use of thiazolone per acre. 1.75 ~ 2.5 grams.

(Source: Jiangsu Agricultural Science and Technology News)

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