Recently, during the visit, the reporter learned that with the rise in temperature, the heart and leaves of spring chilli peppers are shrinking. Many vegetable farmers think that they are viral diseases, but the control effect is not ideal. What causes the shrinkage of the heart of the pepper? Is it necessarily caused by a virus disease? The reporter consulted Shao Shuce, a special expert of the newspaper. Teacher Shao believes that the cause of the shrinkage of the heart and leaves of pepper is not only the virus disease but also the locust infestation and the phytotoxicity. In addition, the symptoms of heart leaf shrinkage caused by different causes vary, and they must be differentiated and properly controlled.
After pepper infection with mosaic virus disease symptoms: mosaic virus disease is divided into light mosaic and heavy mosaic. The light mosaic leaves showed a slight chlorosis of the veins, or a dense, light green and mottled pattern. The diseased plants had no obvious deformity or dwarf and no deciduous leaves; the peppers infected with heavy mosaic virus disease showed yellow-green mottled leaves and leaves. Irregular, leaf veins shrink. The main cause of pepper leaf shrinkage is heavy mosaic virus disease, with yellow-green mottles and wrinkles on the leaves. The appearance of yellow-green mottle is an important feature of differentiation.
Control measures: You can spray the virus A500 times 300 times more mixed ningnanmycin, 0.5% mushroom proteoglycan water agent 200-300 times, 3.85% virus will be grams of water emulsion 600 times. The "agricultural knowledge" melon and fruit introduced polyhydroxynaphtholene to prevent viral diseases. The principle is that spraying on plant leaves can not only directly inhibit virus replication, but also indirectly prevent virus infection by inducing induced resistance of the host, so that the compound has a therapeutic effect and a preventive effect. In the experiment, 24 hours before the virus inoculation, the relative preventive effects of 83.7% and 76.7% on the squash virus disease and corn dwarf mosaic disease were respectively, and the prevention effect was better.
The locusts injure the heart and leaves of peppers. Symptoms: The locusts are susceptible to the young leaves and tender stems of the peppers. The backs of the affected leaves are gray-brown or yellowish-brown, and have oily luster or oil immersion. The edges of the leaves curl downwards. The affected young stems and leaves turned brown and distorted. The severe plants were dry at the top. If it is a flower bud, serious people do not flower and bear fruit. The oily luster of the affected part is an important identification feature. In addition, aphids are also important transmission routes for viral diseases and should be strengthened.
Control measures: Spraying 1.8% abamectin EC 3000-4000 times, 1% matrine 600 times. Focus on the back of young leaves, flowers and young fruit.
Phytotoxicity: There are two types of phytotoxicity, one is hormonal intoxication, and the other is phytotoxicity caused by excessive spray concentration. Hormone poisoning occurs mainly during the nursery period to control the growth of the plant. Therefore, it mainly occurs on the young leaves near the growing point, the leaf veins are twisted and twisted, the leaves are thick and stiff, the color is darkened, and the leaf margins are rolled up. The spraying of drugs caused by the concentration of the whole plant can occur, the heart is particularly serious.
Prevention and control measures: phytotoxicity can be sprayed more than 6,000 times the love to add more than 500 times the nucleotide leaf fertilizer to ease.
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