Sheath blight: It mainly damages leaf sheaths and leaves. In severe cases, it can also harm rice ear and deep stems. Leaf sheaths usually develop first, then leaves. Generally, small green spots appear on the surface near the water surface and gradually expand into an oval shape. Finally, moire-like large spots are synthesized. Light yellow leaves, heading difficulties, rice yield decreased, severe rice plants often cause lodging or smashing dead, so that a serious reduction in rice production. Paddy fields with a disease incidence rate above 10% at the ear stage need to be controlled by drugs. 5% Jinggangmycin, 20% Jinggangmycin powder and 25% triadimefon wettable powder have better control effect on sheath blight.
Rice blast disease: Rice blast disease can occur from the seedling stage to the grain filling stage. The main damage to the leaves and the neck of the panicle, the late stage is mainly the panicle blast and grain borer. The typical symptom of leafhoppers is the appearance of a spindle-shaped, grayish-yellow, yellowish, and brownish-necrotic line of chronic lesions or a round, water-dark, gray-green, acute lesion. In the event of head and neck spasm, gray and black lesions appear on the neck of the ear, and then the whole ear becomes white. Grain pods with early onset of grain husks turn grayish and form valleys, and late onset kernels produce brown ovals or irregular lesions. Severely darken the rice grains. The focus of rice blast prevention and control is susceptible varieties, sensitive period and old rice blast area. Immediately after the discovery of the disease center or acute lesions, in the old ward, planting Xiangzaoxian No. 31, Xiangzao No. 24 and other susceptible varieties should be given a protective agent at the end of booting stage, beginning of breakage, and heading stage. , to prevent the most serious threat of neck and neck. If the weather continues to be conducive to the onset of disease, another drug may be given at the beginning of the grouting period. Available agents are: 20% tricyclazole wettable powder, 40% Fuji No.1 EC, 16% rice harvest wettable powder and so on.
Rice planthoppers: Adults and nymphs can all feed on the base of the rice culm. The damaged rice leaves are yellow, the rice plants are low in growth, and the heading is poor. When the damage is severe, the seedlings appear spotted perforated lodging and yellowing, resulting in a decrease in grain plumpness and even failure of the grain. Rice planthoppers occur at the base of the plant. When they are found, they often occur in large quantities and cause serious damage. Therefore, inspections should be made frequently. General investigation of 100 蔸禾, on average, each pod with 10 worms or more must be quickly controlled. Control method is coarse water spray, let the liquid settle to the base of the rice plant. Commonly used pesticides include 20% buprofezin WP, 10% imidacloprid WP and 80% DDVP.
Leaf roller: leaf blade damage, leaf feeding, leaf blade tip of the affected leaf blade is rolled into a cylindrical bug, and there is a transparent white stripe on the leaf, which seriously affects the photosynthesis of the leaf, resulting in insufficient grain and empty grains. . For the vertical leafhopper, many farmers are used to seeing insects. This is wrong. When the amount of production does not reach the prevention and control index, the application of pesticides is not only not worthwhile, but also wastes labor and pollutes the environment, and it also enhances the resistance of insect pests. A rice field with 30 to 35 new worm-worms per 100 hoe heads is the target field for prevention. In the larval hatching peak period to the peak of 1st inoculation better control effect. The effective medicines for preventing and controlling vertical leafhoppers include: 5% Ruijin special glue suspension, 10% imidacloprid wettable powder, 80% insecticidal powder, and 1.8% avermectin emulsion to spray water.
The stem borer: The main damage to the stem, resulting in a large increase in dead booties, white panicles, cereals, seriously affecting yield. From heading to heading stage of early rice, the development of larvae of S. indica is in the stage of young age, and the application of pesticides is better at this time. The effective agents are 5% Ruijin special suspension, 90% crystal trichlorfon bt emulsion and 18% insecticidal double. The severed Qihuan block occurred in the Huaihua rice planting field. The rice straw should be cut along with the picking and away from the exposure of the paddy fields. At the same time, the rice piles should be dumped into the mud and filled with water in a timely manner to prevent the residual larvae from moving into the middle and late rice fields and continue to harm.
It is necessary to remind farmers that the chemical method is only one of the means of pest control in rice. The more important of rice pest control is the implementation of comprehensive prevention and control based on the selection of high-resistance varieties, balanced fertilization, and fitness cultivation, and agricultural control and biology. Prevention together. For example, ducklings in rice fields can effectively control the base insect pests such as rice planthoppers, reduce sheath blight and damage to rice weeds, and increase income. The key to preventing pests at the ear stage of rice is to use a combination of broccoli-preserving drugs at the earliest stage of the earliest stage, that is, 5% to 10% of the heading time. According to the forecasts of the plant protection department, the agents that can simultaneously treat several pests and diseases or the several counterparts can be selected. According to the amount of mixed use, to achieve a single application at the same time the purpose of controlling a variety of pests. In the panicle stage, the rice plants are tall and the field is covered with a damp cover. When spraying, sufficient amount of water must be used. The water consumption per mu can not be less than 50 kg. At the time of spraying and 3 to 5 days after application, the paddy field must maintain a water layer of about 3 cm. After the application of pesticides, it is necessary to check the control effect in a timely manner and find that the effect is not ideal. Do not use highly toxic, highly toxic and pyrethroid pesticides, and ban chemical pesticides 10 to 15 days before harvest.
Rice blast disease: Rice blast disease can occur from the seedling stage to the grain filling stage. The main damage to the leaves and the neck of the panicle, the late stage is mainly the panicle blast and grain borer. The typical symptom of leafhoppers is the appearance of a spindle-shaped, grayish-yellow, yellowish, and brownish-necrotic line of chronic lesions or a round, water-dark, gray-green, acute lesion. In the event of head and neck spasm, gray and black lesions appear on the neck of the ear, and then the whole ear becomes white. Grain pods with early onset of grain husks turn grayish and form valleys, and late onset kernels produce brown ovals or irregular lesions. Severely darken the rice grains. The focus of rice blast prevention and control is susceptible varieties, sensitive period and old rice blast area. Immediately after the discovery of the disease center or acute lesions, in the old ward, planting Xiangzaoxian No. 31, Xiangzao No. 24 and other susceptible varieties should be given a protective agent at the end of booting stage, beginning of breakage, and heading stage. , to prevent the most serious threat of neck and neck. If the weather continues to be conducive to the onset of disease, another drug may be given at the beginning of the grouting period. Available agents are: 20% tricyclazole wettable powder, 40% Fuji No.1 EC, 16% rice harvest wettable powder and so on.
Rice planthoppers: Adults and nymphs can all feed on the base of the rice culm. The damaged rice leaves are yellow, the rice plants are low in growth, and the heading is poor. When the damage is severe, the seedlings appear spotted perforated lodging and yellowing, resulting in a decrease in grain plumpness and even failure of the grain. Rice planthoppers occur at the base of the plant. When they are found, they often occur in large quantities and cause serious damage. Therefore, inspections should be made frequently. General investigation of 100 蔸禾, on average, each pod with 10 worms or more must be quickly controlled. Control method is coarse water spray, let the liquid settle to the base of the rice plant. Commonly used pesticides include 20% buprofezin WP, 10% imidacloprid WP and 80% DDVP.
Leaf roller: leaf blade damage, leaf feeding, leaf blade tip of the affected leaf blade is rolled into a cylindrical bug, and there is a transparent white stripe on the leaf, which seriously affects the photosynthesis of the leaf, resulting in insufficient grain and empty grains. . For the vertical leafhopper, many farmers are used to seeing insects. This is wrong. When the amount of production does not reach the prevention and control index, the application of pesticides is not only not worthwhile, but also wastes labor and pollutes the environment, and it also enhances the resistance of insect pests. A rice field with 30 to 35 new worm-worms per 100 hoe heads is the target field for prevention. In the larval hatching peak period to the peak of 1st inoculation better control effect. The effective medicines for preventing and controlling vertical leafhoppers include: 5% Ruijin special glue suspension, 10% imidacloprid wettable powder, 80% insecticidal powder, and 1.8% avermectin emulsion to spray water.
The stem borer: The main damage to the stem, resulting in a large increase in dead booties, white panicles, cereals, seriously affecting yield. From heading to heading stage of early rice, the development of larvae of S. indica is in the stage of young age, and the application of pesticides is better at this time. The effective agents are 5% Ruijin special suspension, 90% crystal trichlorfon bt emulsion and 18% insecticidal double. The severed Qihuan block occurred in the Huaihua rice planting field. The rice straw should be cut along with the picking and away from the exposure of the paddy fields. At the same time, the rice piles should be dumped into the mud and filled with water in a timely manner to prevent the residual larvae from moving into the middle and late rice fields and continue to harm.
It is necessary to remind farmers that the chemical method is only one of the means of pest control in rice. The more important of rice pest control is the implementation of comprehensive prevention and control based on the selection of high-resistance varieties, balanced fertilization, and fitness cultivation, and agricultural control and biology. Prevention together. For example, ducklings in rice fields can effectively control the base insect pests such as rice planthoppers, reduce sheath blight and damage to rice weeds, and increase income. The key to preventing pests at the ear stage of rice is to use a combination of broccoli-preserving drugs at the earliest stage of the earliest stage, that is, 5% to 10% of the heading time. According to the forecasts of the plant protection department, the agents that can simultaneously treat several pests and diseases or the several counterparts can be selected. According to the amount of mixed use, to achieve a single application at the same time the purpose of controlling a variety of pests. In the panicle stage, the rice plants are tall and the field is covered with a damp cover. When spraying, sufficient amount of water must be used. The water consumption per mu can not be less than 50 kg. At the time of spraying and 3 to 5 days after application, the paddy field must maintain a water layer of about 3 cm. After the application of pesticides, it is necessary to check the control effect in a timely manner and find that the effect is not ideal. Do not use highly toxic, highly toxic and pyrethroid pesticides, and ban chemical pesticides 10 to 15 days before harvest.