Rice bacterial blight is a common and multi-pathogenic disease in rice production in Dali City, and it is one of the most serious diseases that currently harm rice. The damage site of bacterial blight is mainly leaves, and all the tops are dead. Due to the early onset of the disease, it often starts to appear before and after heading; the damage caused by severe years can reach about 50%.
First, the symptoms and harm
According to the occurrence of different growth stages of rice, it can be divided into three types.
1. Leaf-cured type: mainly occurs in the middle and late stages of rice, and the lesions are limited to the leaves and sheaths.
2. Regulating type: mainly occurs in the seedling stage, the late stage of the field and the jointing stage.
3, yellow leaf type: the old leaves of the diseased plants have normal color, and the newly emerged leaves are evenly pale green or yellow and yellow-green wide strips, and the growth of the diseased plants is inhibited.
Second, the cause of the disease
Bacterial blight of rice is a bacterial disease. The bacteria mainly overwinter on rice seeds and straw, and are mainly transmitted by diseased rice straw in the affected areas. The disease-free areas are mainly introduced by diseased seeds. The occurrence of bacterial blight is closely related to climate, fertilizer management, and variety resistance.
Third, prevention and treatment methods
The characteristics of the pathogen of rice bacterial blight: many sources, wide channels, long infestation time, and then infect ordinary, so take "prevention first, comprehensive prevention".
(1) Select disease-resistant varieties and disease-free seeds.
(2) Chemical control: 5% bacteria can be used to clear 200 ml/mu or 15% leaf dryness 100 g/mu. In the initial stage of the disease, after 4 pm, the water is 100-120 kg per acre. Spray once every 7 days, and prevent it 2-3 times in a row.
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