How to prevent and cure tobacco cucumber mosaic disease?
How to prevent and cure tobacco cucumber mosaic disease? Cucumber mosaic disease is the most common and widespread tobacco virus disease. The virus is mainly transmitted by aphids and spreads with the migration of aphids. The disease generally occurs in the seedling cluster stage after tobacco seedling transplanting, which often leads to the stagnation of plant growth and development and affects the yield. The veins of the leaves are transparent at the beginning of the disease, and then become flowers and leaves a few days later, the leaves become narrow and twisted, the hairs of the epidermis fall off and lose their luster. The diseased plants showed dwarfism and root dysplasia. The prevalence of cucumber mosaic disease is closely related to the number and activity of aphids. According to the investigation in Huang-Huai tobacco area, there are two peak periods of tobacco aphid migration in the process of tobacco seedling growth: the first is from late March to early April, and the second is from May 10 to 25 after transplanting. Generally, about 10 days after the field tobacco aphid entered the peak period of migration, the disease was the most serious. Since tobacco cucumber mosaic disease is mainly transmitted by aphids, the control of aphids is the key to the control of the disease. Silver gray plastic film mulching is often used in production to ward off aphids. In addition, measures such as cultivating strong seedlings, planting tobacco deeply, strengthening mid-ploughing and soil cultivation, scientific fertilization and watering can also reduce the occurrence of diseases. The chemical control was generally sprayed with 2 ‰ zinc sulfate and once net spray for 3 times during the seedling bed stage and within half a month after transplanting. When tobacco aphids occur, strong knockdown pesticides such as Yichuanjing should be used to expel aphids and prevent diseases. Click to get more tobacco planting techniques click to get more flower planting techniques
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What if the potted azaleas lose their leaves? causes and solutions
Azalea characteristics are like acid soil, like wet, like warm; afraid of thick fertilizer, afraid of exposure, afraid of drought and flood. Management is not good often abnormal leaves, the following to introduce you to the azalea leaves the reasons and solutions. What about azaleas falling off leaves? environmental malaise
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How to control tobacco mosaic disease?
How to control tobacco mosaic disease? Tobacco mosaic disease, one of the three major tobacco diseases, is common in all tobacco areas of our province. In the early stage of seedling or field disease, the yield can be reduced by 30%, and the economic loss can reach 50% to 70%. After topping, the disease has little effect on yield, but has a great impact on quality. The disease is caused by a variety of viruses.
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