Sheath blight: mainly damages leaf sheaths and leaves, and can also damage rice ears and penetrate stalks in severe cases. Generally, the leaf sheath first develops, then the leaves. Generally, small spots of green water-stained spots appear on the surface near the water, and gradually expand into an elliptical shape, and finally a cloud-like large spot is synthesized. The light leaves are yellow, the heading is difficult, and the rice yield is reduced. In severe cases, the rice plants are often lodging or the whole rice is dead, which causes the rice to be seriously reduced. Paddy fields with an incidence rate of more than 10% at the ear stage need to be controlled by drugs. 5% of Jinggangmycin aqueous solution, 20% of Jinggangmycin powder and 25% of rusting WP have good control effect on sheath blight.
Rice blast: Rice blast can occur in the seedling stage to the filling stage. It mainly harms the leaves and the neck of the rice, and the late stage is mainly the panicle neck and the mites. The typical symptoms of leaf mites are a fusiform, grayish-white-yellow, yellow-lined line of chronic lesions or round water-stained gray-green acute lesions on the leaves. When the panicle neck sputum occurs, gray-black lesions appear first on the neck of the ear, and the whole ear becomes white-eared. The early grainy hulls of the mites turn grayish white, forming a glutinous grain, and the late-occurring grain produces brown oval or irregular lesions. In severe cases, the rice grains can be blackened. The focus of rice blast prevention and control is on susceptible varieties, sensitive periods and old rice blast areas. When the disease center or acute lesion is found, it should be applied immediately. In the old disease area, the susceptible varieties such as Xiangzao 31 and Xiangzao 24 should be planted once at the end of the booting stage, at the beginning of the rupture and at the heading stage. To prevent the most serious damage to the neck. If the weather continues to favor the disease, a second dose can be administered at the beginning of the filling. The available agents are: 20% tricyclazole wettable powder, 40% Fuji No. 1 emulsifiable concentrate, 16% rice harvest WP, and the like.
Rice planthopper: Both adults and nymphs can be eaten at the base of the rice plexus. The damaged rice leaves are yellow, the rice plants are low in growth, and the heading is poor. When the damage is serious, the seedlings will have a patchy perforation and yellowing, which will result in a decrease in grain plumpness and even no grain. Rice planthoppers occur at the base, and when they are discovered by farmers, they tend to be large in quantity and harmful, so they should be checked frequently. Generally, 100 蔸 He is checked, and an average of 10 or more ridges per worm must be quickly prevented. The control method is a coarse water spray to allow the liquid to settle to the base of the rice plant. Commonly used pesticides are 20% chlorpyrifos WP, 10% imidacloprid WP and 80% dichlorvos.
Long-rolled leafhopper: harming leaves and feeding on mesophyll, the tip of the damaged leaf is rolled into a cylindrical insect, and there are transparent white streaks on the sputum, which seriously affects the photosynthesis of the leaves, causing the grain to be insufficient, and the empty granules increase and the harvest is poor. . It is not right for many farmers to get used to seeing worms. When the amount is not reached, the application is not only cost-effective, but also wastes labor, pollutes the environment, and enhances the resistance of pests. Generally, rice fields with 30 to 35 new worms per 100 蔸 are the control fields. In the peak period of larval hatching to the peak of 1st age, the application of pesticides is better. The agents which have good effects in controlling the vertical leaf roller are: 5% ruthenium suspension, 10% imidacloprid WP + 80% insecticidal powder, and 1.8% avermectin emulsifiable water spray.
Chilo suppressalis: Mainly harms the stems, causing a large increase in dead booting ears, white spikes and waxy valleys, which seriously affects the yield. From the beginning of the early rice to the heading stage, the development of the larvae of the stem borer is in the low age stage, and the application of the drug is better. The better effect agent is 5% Ruijin special suspension, 90% crystal trichlorfon bt emulsion plus 18% insecticidal double. Severe mounds occur in the stem borer, and the straw should be cut with the cut, away from the rice field, and the rice piles should be turned into the mud in time to fill the field water to prevent the residual larvae from moving into the middle and late rice fields to continue the harm.
It is necessary to remind farmers friends that chemical methods are only one of the means of prevention and control of rice pests and diseases. More importantly, prevention and control of rice pests and diseases is to implement comprehensive prevention and control on the basis of high-resistance varieties, balanced fertilization and fitness cultivation. Prevention and control together. For example, raising ducks in rice fields can effectively control basal pests such as rice planthoppers, reduce the damage of sheath blight and weeds in rice fields, and increase income. The key to controlling pests and diseases at the ear of rice is to mix a fixed-sealing medicine at the initial stage of the break, that is, 5% to 10% of the heading. According to the forecast of the plant protection department, the agent that can treat several pests at the same time or several kinds of counterparts can be selected. Mix and use according to the amount of use, to achieve the purpose of a single application while controlling a variety of pests. The rice plant in the ear stage is tall and the field is sullen. The amount of water must be used when applying the medicine. The water consumption per mu should not be less than 50 kg. 3 to 5 days after application and 3 to 5 days after application, the paddy field should maintain a water layer of about 3 cm. After the application, the effect should be checked in time, and the effect is not satisfactory. Do not use highly toxic, highly toxic and pyrethroid pesticides, and ban chemical pesticides 10 to 15 days before harvest.
Rice blast: Rice blast can occur in the seedling stage to the filling stage. It mainly harms the leaves and the neck of the rice, and the late stage is mainly the panicle neck and the mites. The typical symptoms of leaf mites are a fusiform, grayish-white-yellow, yellow-lined line of chronic lesions or round water-stained gray-green acute lesions on the leaves. When the panicle neck sputum occurs, gray-black lesions appear first on the neck of the ear, and the whole ear becomes white-eared. The early grainy hulls of the mites turn grayish white, forming a glutinous grain, and the late-occurring grain produces brown oval or irregular lesions. In severe cases, the rice grains can be blackened. The focus of rice blast prevention and control is on susceptible varieties, sensitive periods and old rice blast areas. When the disease center or acute lesion is found, it should be applied immediately. In the old disease area, the susceptible varieties such as Xiangzao 31 and Xiangzao 24 should be planted once at the end of the booting stage, at the beginning of the rupture and at the heading stage. To prevent the most serious damage to the neck. If the weather continues to favor the disease, a second dose can be administered at the beginning of the filling. The available agents are: 20% tricyclazole wettable powder, 40% Fuji No. 1 emulsifiable concentrate, 16% rice harvest WP, and the like.
Rice planthopper: Both adults and nymphs can be eaten at the base of the rice plexus. The damaged rice leaves are yellow, the rice plants are low in growth, and the heading is poor. When the damage is serious, the seedlings will have a patchy perforation and yellowing, which will result in a decrease in grain plumpness and even no grain. Rice planthoppers occur at the base, and when they are discovered by farmers, they tend to be large in quantity and harmful, so they should be checked frequently. Generally, 100 蔸 He is checked, and an average of 10 or more ridges per worm must be quickly prevented. The control method is a coarse water spray to allow the liquid to settle to the base of the rice plant. Commonly used pesticides are 20% chlorpyrifos WP, 10% imidacloprid WP and 80% dichlorvos.
Long-rolled leafhopper: harming leaves and feeding on mesophyll, the tip of the damaged leaf is rolled into a cylindrical insect, and there are transparent white streaks on the sputum, which seriously affects the photosynthesis of the leaves, causing the grain to be insufficient, and the empty granules increase and the harvest is poor. . It is not right for many farmers to get used to seeing worms. When the amount is not reached, the application is not only cost-effective, but also wastes labor, pollutes the environment, and enhances the resistance of pests. Generally, rice fields with 30 to 35 new worms per 100 蔸 are the control fields. In the peak period of larval hatching to the peak of 1st age, the application of pesticides is better. The agents which have good effects in controlling the vertical leaf roller are: 5% ruthenium suspension, 10% imidacloprid WP + 80% insecticidal powder, and 1.8% avermectin emulsifiable water spray.
Chilo suppressalis: Mainly harms the stems, causing a large increase in dead booting ears, white spikes and waxy valleys, which seriously affects the yield. From the beginning of the early rice to the heading stage, the development of the larvae of the stem borer is in the low age stage, and the application of the drug is better. The better effect agent is 5% Ruijin special suspension, 90% crystal trichlorfon bt emulsion plus 18% insecticidal double. Severe mounds occur in the stem borer, and the straw should be cut with the cut, away from the rice field, and the rice piles should be turned into the mud in time to fill the field water to prevent the residual larvae from moving into the middle and late rice fields to continue the harm.
It is necessary to remind farmers friends that chemical methods are only one of the means of prevention and control of rice pests and diseases. More importantly, prevention and control of rice pests and diseases is to implement comprehensive prevention and control on the basis of high-resistance varieties, balanced fertilization and fitness cultivation. Prevention and control together. For example, raising ducks in rice fields can effectively control basal pests such as rice planthoppers, reduce the damage of sheath blight and weeds in rice fields, and increase income. The key to controlling pests and diseases at the ear of rice is to mix a fixed-sealing medicine at the initial stage of the break, that is, 5% to 10% of the heading. According to the forecast of the plant protection department, the agent that can treat several pests at the same time or several kinds of counterparts can be selected. Mix and use according to the amount of use, to achieve the purpose of a single application while controlling a variety of pests. The rice plant in the ear stage is tall and the field is sullen. The amount of water must be used when applying the medicine. The water consumption per mu should not be less than 50 kg. 3 to 5 days after application and 3 to 5 days after application, the paddy field should maintain a water layer of about 3 cm. After the application, the effect should be checked in time, and the effect is not satisfactory. Do not use highly toxic, highly toxic and pyrethroid pesticides, and ban chemical pesticides 10 to 15 days before harvest.
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