Rice bacterial brown spot disease, also known as bacterial sheath rot, is harmful to leaves, sheaths, stems, nodes, ears, branches and grains. The leaves were initially stained with brown water-soaked spots, and then expanded into a spine-shaped or irregular reddish-brown streaks. The edges showed yellow halos, and the center of the lesions was gray-brown. The lesions often merged into large spots, causing local necrosis of the leaves. Bacterial pus. The damage of leaf sheaths occurred on the ear mites before the young ears were extracted. The lesions were reddish brown, short strips, and then merged into water-stained irregular large spots. The central taupe was dark and tissue necrosis. Peel the leaf sheath and have dark brown streaks on the stem. When the flag leaf is severe, the ear can not be extracted. The cobs, husks and other parts are damaged to produce near-round brown spots. In severe cases, the entire hulls become brown and penetrate into the rice grains. Grain lesions are easily confused with rice leaf blight, and a large number of bacterial pus spills can be seen at the incision. Pillar Lamp,Modern Pillar Lights,Outdoor Column Lights,Outdoor Led Street Light Changzhou Jingui Lighting Technology Co., Ltd , https://www.jinguilighting.com
Rice bacterial brown spot disease bacteria overwinter in seeds and diseased tissues. Invading the host from the wound can also invade from the water hole and the air hole. Bacteria can survive in water for 20-30 days and spread with water. Rainstorms and typhoons can increase the incidence of diseases. Partial application of nitrogen fertilizer, excessive irrigation or water irrigation, easy to develop. The acidity of the soil is heavy.
The control methods of rice bacterial brown spot disease are as follows:
(1) Strengthen quarantine and prevent the transfer and transfer of diseased seeds. (2) Shallow water irrigation to prevent field water flow. Formulated with fertilization, avoid applying nitrogen fertilizer. Remove weeds from the fields in time and treat the straw with straw. (3) Pesticide control When the disease spots appear on the leaves or the leaves of the flag leaves are exposed to the heading, the heading stage is 2% plus 80-100 ml/mu or 2% plus 80 ml + 50% carbendazim 80 ml. / acre, or 25% leaf cumin WP 170-340 g / acre, or 14% amide copper water agent 125-170 ml / acre, or 10% chloramphenicol wettable powder 60-70 g / acre, 15-20 liters of water and leaf spray with water or other fungicides .