Beware of bacterial bacterial streak
Characteristics of damage: Bacterial leaf streak of rice mainly affects the leaves. The lesions appear as dark green water-stained translucent spots at the beginning of the lesion, and then gradually expand along the vein direction. When expanded, it is limited by veins. The lesions are thin lines or short-dashed lines and are brownish-brown. When the humidity in the field is large, the surface of the diseased area has honey-yellow fungus with pus overflowing, dew-like and densely dense. The number is much smaller than that of bacterial leaf blight, and after the dry knot, it is yellow gum-like small particles, shaped like a dotted line and not easy to fall off. When the disease is severe, the plaques fuse into irregular tan to bluish white plaques. The appearance is somewhat similar to that of bacterial leaf blight, but many transparent thin strips can be observed for light observation. When the disease is severe, the leaves curl and the field appears yellowish-white.
Control methods: The disease is infectious, and once the disease alone is difficult to control through chemical control, comprehensive prevention and control should be adopted. 1 Quarantine: Strictly control the out-regulation of seeds in the ward to prevent the ward from expanding. 2 Agricultural control: The selection of disease-resistant seed varieties, the different varieties have different levels of susceptibility and loss. Shallow water ground irrigation and timely field drying. Avoid excessive, late application of nitrogen fertilizer. Appropriate application of phosphorus, potassium fertilizer to improve plant resistance, prevent rice seedlings greed green long, induced disease. 3 Chemical control: After finding the central diseased strain, it began to spray 20% Ye Kuning (Ye Qingshuang) wettable powder, 100 g/mu, and 50 l water. When the control effect of the leaf cuminine is not obvious, it can be mixed with streptomycin sulfate or agricultural streptomycin 4000 times or strong chlorine extract 2500 times while applying Ye Kuning, which can significantly improve the control effect. For areas where the disease is common, seeds should be soaked with fresh water for 12 to 24 hours before sowing, and soaked for 12 to 24 hours with 300 times 85% strong chlorine. After soaking, the seeds should be sowed. A strong chlorine extract was sprayed on each seedling at the three-leaf stage and before the pullout stage. In the heading stage, the use of 4% amidin copper, 20% Yeqingshuang and potassium permanganate plus salt water spray, the effect of up to 80%.
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