How to control the three major diseases of rice?

How to control the three major diseases of rice? Please introduce the control methods of the three major rice diseases can refer to the following methods for control: 1. Rice blast (1) Leaf blast: dark green, nearly round or oval spot, and then slightly pointed at both ends; when there are usually acute disease spots or disease centers, especially in rice fields with high nitrogen application rate and luxuriant growth, when the total number of leaf blast spots on 20 holes of rice reaches more than 400 during the whole growth period before heading, the pesticide must be applied twice in a row with an interval of 3 to 5 days. (2) panicle neck blast: occurs on the ear neck, the disease spot is light brown at first, and then produces brown or dark brown discoloration around the ear neck, causing the white ear or grain not to be full. The control of panicle neck blast is mainly at the late booting stage and initial heading stage of rice, especially at the initial heading stage (when the rice ear just shows the sword leaf bud). At present, the commonly used control agents for leaf blast and panicle neck blast are: ① 20% tricyclazole wettable powder 100g / mu, water 50kg spray. ② 40% Daomiaoling wettable powder is sprayed with 75ml per mu and 50kg of water. ③ 50% carbendazim wettable powder 75 g / mu, 50 kg water spray. two。 False smut is the main disease of rice panicle, which damages some grains of rice panicle, most of which is one grain per ear, up to dozens of grains. It was first seen that the yellowish mass appeared at the suture of the glume and gradually expanded to cover the whole glume. The disease grain was 3 or 4 times larger than that of Jian Gu and became a black-green and smooth fungus. Finally, it cracked and scattered the dark green powder. The disease is mainly susceptible to rice before breaking and heading, so the appropriate period of control is about 5 days before breaking and heading. The commonly used control agents are: ① 5% Jinggangmycin water agent 400ml per mu, spray 40kg to 50kg water. ② 25% pink rust would rather be wettable powder ① mu with 50 grams, 40 kilograms of water spray. 3. Rice bacterial blight damage leaves, the disease generally starts from the leaf tip or leaf edge, the initial dark green short linear, and then rapidly extends up and down along the leaf edge or middle rib, can extend along the leaf vein to the leaf sheath, forming dark yellow striped disease spots, and finally withered. The disease can occur at the seedling stage, and it is often serious before and after heading because of the slow onset in the early stage. Therefore, it is necessary to control rice before heading, especially the emergence of acute disease spots, which is conducive to the climate of the disease, and strengthen the prevention and control of diseased fields and adjacent rice fields after long-term overcast and rain. Commonly used control agents are: ① 20% Yeqing double wettable powder, 100g per mu, 50kg spray with water. ② 50% carbendazim water-soluble powder, 40 grams per mu, plus 50 kilograms spray. ③ leaf withered powder 500x liquid spray. When using pesticides, try to use low-residue pesticides to reduce non-point source pollution in Erhai Lake. Click to get more rice planting techniques click to get more food crop planting techniques