Rice should focus on controlling rice blast and rice planthopper in summer.
1. Rice blast prevention and control methods: seed treatment, rice seeds should be selected from disease-free fields or light disease fields. Selection of resistant varieties and selection of resistant varieties are cost-effective measures to control rice blast, and are also key measures for comprehensive prevention and control. Strengthen cultivation management, ensure base fertilizer, rationally apply nitrogen, phosphorus and potassium fertilizers, promote the healthy growth of rice plants, and cooperate with water management to create environmental conditions that are not conducive to the prevalence of rice blast. Grasp the key and spray protection at the right time. The chemical control of rice blast must establish the guiding ideology of “prevention firstâ€. Miaoye ç˜Ÿç‹ ç˜Ÿç‹ ç§§ 防治 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , In combination with climatic conditions, appropriate control measures should be taken; the prevention and control of sorghum should focus on the protection of heading stage. If the stage mites occur at the booting stage and increase rapidly, especially the acute plaques in the flag leaves or the incidence of occipital plaques are high. When weather conditions are conducive to disease prevalence, it is necessary to determine the prevention and control of the field and to do a good job in pesticide control. Commonly used agents: 20% tricyclazole wettable powder, 40% rice bran emulsifiable concentrate, 75% Fengdeng WP, 40% Fuji No. 1 emulsifiable concentrate.
2. Control method of rice planthoppers Control method of Laodelphax striatellus: Agricultural control: Weeds in the edge of the field and the edge of the ditch are removed before harvesting. When harvesting, the straw is hit, picked, and sun-dried, and is not piled on the edge of the field to prevent weeds and residual insects on the straw from jumping into the late rice fields. Immediately after the harvest, the ploughing and irrigating water will be used, and the late rice will be inserted into the field early, and the field side spray protection will be adopted. The timely removal of the weeds in the rice fields can eliminate many gray locust eggs. Protect and utilize natural enemies: reduce the number of applications, use low-toxic pesticides as much as possible to protect natural enemies. Chemical control: In the early rice field, there are more than 2 adults per square foot and more than 5 adults in the late rice field. The control period is appropriate for the adult migration period and the egg incubation period. Commonly used agents: 50% diazinon emulsifiable concentrate, 10% Dagongchen wettable agent.
Prevention and control methods of brown planthopper: Agricultural control: Select insect-resistant rice varieties, carry out scientific fertilizer and water management, bake the fields in time, avoid partial application of nitrogen fertilizer, prevent the late stage of gluttony in rice, and create ecological conditions that are not conducive to brown fly breeding. Biological control: There are many parasitic and predatory natural enemies in the brown planthoppers. In addition to parasitic wasps, black-shouldered green-spotted owls, ladybugs, etc., spiders, nematodes and fungi have a great inhibitory effect on the occurrence of brown planthopper. Should be protected and utilized to improve natural control capabilities. Chemical control: According to the type of rice varieties and the occurrence of planthoppers, adopt the strategy of pre-pressure control or the main damage generation, select high-efficiency, low-toxic, long-lasting pesticides, try to consider the protection of natural enemies, master the nymph 2 3 years old application. Commonly used agents: 10% Dagong WP, 50% diazinon emulsifiable concentrate.
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