The right medicine to prevent summer pepper disease
There are many habits of planting peppers in summer in many places in China. In summer, it is hot and rainy, and there are many diseases and pests of peppers. The spread speed is fast and the management is difficult. According to the author's recent field investigation, due to the recent high temperature and drought, some peppers have begun to find pepper virus disease, anthracnose and sassafras, and now briefly introduce the symptoms and prevention methods of these diseases.
Capsicum virus disease
Symptoms: Capsicum virus disease is mainly mosaic virus disease. It often occurs in the top leaves, and the symptoms are leaf mosaic, yellowing, and leaf rolling; the plants appear to shrink or become streaky on the fruit. In severe cases, the whole plant leaves are caused, and the photosynthesis of pepper is severely blocked or the top becomes black and necrotic.
Prevention and treatment methods: The prevention and treatment of pepper virus disease should follow the principle of “prevention of disease prevention firstâ€. Now it is the wheat harvest season, the temperature is high, the locusts, the locusts, the thrips are heavier, these insects are the chief culprit in the spread of viral diseases. The pests can be controlled at the stage of spotting by covering the insect net to avoid insects and pesticides. It is possible to select a shelter net with a mesh size greater than 60 mesh. The chemical control can be sprayed with 400-500 times of Pridden fish protein after colonization, sprayed once every 5-7 days, and sprayed continuously for 2~3 times to ensure the plant. Strong growth and enhance the antiviral ability of plants. For the pepper that has already developed the virus, you can use the virus or plant disease 1000 times + Prideon fish protein 400 times + imidacloprid or 1500 times the net; for the Hummer hazard heavy plot, you can use Ai Shishi 1500 times liquid. + Pridden fish protein 400 times solution, after mixing several drugs, the whole plant is sprayed, once every 5 days, and sprayed continuously for 3~4 times to prevent and control aphids and thrips to prevent capsivirus disease. The effect is ideal.
Capsicum anthracnose
Symptoms: The leaves are infected, initially fading green water-soaked spots, gradually turning brown, light gray in the middle, and small black spots on the lesions. The handle is damaged and brown spots are formed. The fruit is damaged, and it is initially flooded with yellow-brown round spots or irregular spots. The spots have raised concentric circles and many black dots. When wet, the surface of the lesions overflows with red sticky substances.
Control methods: strengthen field management. Reasonable close planting, formula fertilization, avoid high temperature and high humidity, pay attention to drainage, timely remove diseased leaves, diseased fruits and residues, pepper topdressing appropriate increase of phosphorus and potassium fertilizer use, combined with watering per acre can be used with water to pridden fish protein 2 ~4 kg + balanced NPK water soluble fertilizer 5~10 kg. It is best to prevent it in advance. At the beginning of the disease, it can spray 70% thiophanate-methyl WP 600-800 times solution, or 80% mancozeb WP 500 times solution; or use imiline 1200-1500 times solution. Spray once every 5~7 days and spray continuously for 3~4 times.
Chili tea jaundice
In summer, there are many insect pests in the open air. In addition to aphids, cotton bollworms and thrips, tea jaundice is also prone to occur. The sassafras is not easy to be found in the early stage, and it is not visible to the naked eye at first. However, once it occurs, it will cause large areas of yellow leaves and fallen leaves of peppers. In the later stage, it is often impossible to prevent them. Therefore, tea jaundice should be prevented in advance.
Control method: Because the sassafras has strong tenderness, it is mainly distributed in the apex of the top bud of the crop, and the damage is the most serious. Therefore, it is necessary to prevent the drug from being sprayed in advance, and it is necessary to focus on spraying in the young part. In recent years, according to many farmers' reports and our field trials, spraying Pridden fish protein can effectively prevent and reduce the damage of sassafras. The specific method is: use Pridden fish protein 400 times +1.8% avermectin EC 1500 ~ 2000 times liquid or 15% 哒螨 乳 EC 3000 times liquid + Pridetan fish protein 400 times solution, foliar spray 2 ~3 times, can effectively prevent and control the harm of sassafras.
Zhang Lining, Professor of Qingdao Agricultural University
Farmers Daily
Capsicum virus disease
Symptoms: Capsicum virus disease is mainly mosaic virus disease. It often occurs in the top leaves, and the symptoms are leaf mosaic, yellowing, and leaf rolling; the plants appear to shrink or become streaky on the fruit. In severe cases, the whole plant leaves are caused, and the photosynthesis of pepper is severely blocked or the top becomes black and necrotic.
Prevention and treatment methods: The prevention and treatment of pepper virus disease should follow the principle of “prevention of disease prevention firstâ€. Now it is the wheat harvest season, the temperature is high, the locusts, the locusts, the thrips are heavier, these insects are the chief culprit in the spread of viral diseases. The pests can be controlled at the stage of spotting by covering the insect net to avoid insects and pesticides. It is possible to select a shelter net with a mesh size greater than 60 mesh. The chemical control can be sprayed with 400-500 times of Pridden fish protein after colonization, sprayed once every 5-7 days, and sprayed continuously for 2~3 times to ensure the plant. Strong growth and enhance the antiviral ability of plants. For the pepper that has already developed the virus, you can use the virus or plant disease 1000 times + Prideon fish protein 400 times + imidacloprid or 1500 times the net; for the Hummer hazard heavy plot, you can use Ai Shishi 1500 times liquid. + Pridden fish protein 400 times solution, after mixing several drugs, the whole plant is sprayed, once every 5 days, and sprayed continuously for 3~4 times to prevent and control aphids and thrips to prevent capsivirus disease. The effect is ideal.
Capsicum anthracnose
Symptoms: The leaves are infected, initially fading green water-soaked spots, gradually turning brown, light gray in the middle, and small black spots on the lesions. The handle is damaged and brown spots are formed. The fruit is damaged, and it is initially flooded with yellow-brown round spots or irregular spots. The spots have raised concentric circles and many black dots. When wet, the surface of the lesions overflows with red sticky substances.
Control methods: strengthen field management. Reasonable close planting, formula fertilization, avoid high temperature and high humidity, pay attention to drainage, timely remove diseased leaves, diseased fruits and residues, pepper topdressing appropriate increase of phosphorus and potassium fertilizer use, combined with watering per acre can be used with water to pridden fish protein 2 ~4 kg + balanced NPK water soluble fertilizer 5~10 kg. It is best to prevent it in advance. At the beginning of the disease, it can spray 70% thiophanate-methyl WP 600-800 times solution, or 80% mancozeb WP 500 times solution; or use imiline 1200-1500 times solution. Spray once every 5~7 days and spray continuously for 3~4 times.
Chili tea jaundice
In summer, there are many insect pests in the open air. In addition to aphids, cotton bollworms and thrips, tea jaundice is also prone to occur. The sassafras is not easy to be found in the early stage, and it is not visible to the naked eye at first. However, once it occurs, it will cause large areas of yellow leaves and fallen leaves of peppers. In the later stage, it is often impossible to prevent them. Therefore, tea jaundice should be prevented in advance.
Control method: Because the sassafras has strong tenderness, it is mainly distributed in the apex of the top bud of the crop, and the damage is the most serious. Therefore, it is necessary to prevent the drug from being sprayed in advance, and it is necessary to focus on spraying in the young part. In recent years, according to many farmers' reports and our field trials, spraying Pridden fish protein can effectively prevent and reduce the damage of sassafras. The specific method is: use Pridden fish protein 400 times +1.8% avermectin EC 1500 ~ 2000 times liquid or 15% 哒螨 乳 EC 3000 times liquid + Pridetan fish protein 400 times solution, foliar spray 2 ~3 times, can effectively prevent and control the harm of sassafras.
Zhang Lining, Professor of Qingdao Agricultural University
Farmers Daily
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