1 Identification method 1.1 Look at the field distribution: As long as 10% of the disease strains are involved in the early stages of scab, it is enough to cause the disease in the whole field. The distribution of viral diseases is mostly scattered. 1.2 Symptoms More scabs are observed: yellowish-green, water-soaked patches appear on the leaves, which then expand into round, near-circular, or irregularly shaped brown-brown lesions. The edges are dark brown, slightly falling, light in the middle, and slightly sunken. The center is easy to perforate. After the young leaves are damaged, the leaves shrink and deformed. Diseased leaves can easily fall off. Virus disease, there are four common types: 1 Mosaic and mottled: leaf surface, fruit surface irregular chlorosis. 2 Yellowing: The diseased leaves turn green evenly and turn yellow. 3 Necrosis: The cells and tissues of the plant died, and the young part of the branches turned brown and died. 4 deformity: thickening of the leaves, small stenosis, leaves and shrinking, but the diseased leaves are not easy to fall off, which is the key difference between the scab disease. Window 1.3 Look at the suddenness after rain: The occurrence and development of scabs are positively related to humidity, and it is often rain that aggravates the symptoms of the disease. The occurrence of viral diseases is related to the number and activity of aphids, and rain does not accelerate the development of viral diseases. 1.4 Observing pathogens: Scabs can be sectioned in lesions and microscopic examinations show bacterial overflow. The virus disease department aseptic overflow phenomenon. 2 Control measures 2.1 Seed disinfection: For the pepper scab, the seeds are soaked in warm water at 56°C for 10 minutes and then transferred to cold water for cooling and then germination. 2.2 to strengthen the cultivation and management: a reasonable dense planting, pay attention to loose soil after dressing, top dressing, promote root development. The field drained in time to reduce the humidity in the field. 2.3 Chemical control: The peppers cultivated in the open area of ​​the lower reaches of the Yangtze River were selected by the agricultural streptomycin 2000 times liquid spray in the early stage of the scab in early July or after the heavy rain, sprayed once every 6-8d, and sprayed 2 to 3 times. In the early stage of the disease, virus disease can be sprayed with 500 times the "leaflet enemy", about 10 days, and sprayed 2 to 3 times. And timely control of locusts, use 10% decane net WP or 10% cypermethrin EC 1000 times spray.
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