At present, the vegetables in various regions have gradually entered the period of nursery and planting after summer and autumn, and the farmers of the two cornices in summer and autumn have to pay special attention to the prevention of chlorotic leaf disease, and reduce the number of tomatoes. Loss caused by virus infection.
The outstanding symptoms of tomato infection with chlorotic yellow leaf curl virus are yellowing of growth points, obvious dwarfing of plants, small and upward curling of leaves, yellowing of leaf edges, fruit setting and fruit enlargement and color turning during fruit setting, and severe harvesting. . Over the past two years, yellow leaf curl virus disease has been severe in our province. It has become one of the major diseases of tomato in the mouth after summer and autumn.
At the current level of research, it is difficult to treat tomato after infection with chlorotic leaf curl virus. Therefore, the most important response to chlorotic leaf curl disease is prevention. The whitefly, aphid and other vector insects are the main transmission route of yellow leaf curl virus disease, so the prevention and control of whitefly is the most important task to prevent the yellow leaf curl virus disease. What is worrying is that many farmers do not attach importance to early prevention and control. They believe that there is no need to control whitefly because of a small number of whiteflies. They do not know that the number of whitefly is exploding. It is very difficult to control pesticides when there are a large number of adults. of.
In the fight against whitefly, the selection of tomato varieties resistant to yellow leaf curl is also the key. Although we can buy tomato varieties that are resistant or even highly resistant to yellow leaf curl virus disease in the market, we have not yet found any varieties that are immune to yellow leaf curl virus disease. Do not think that planting is resistant. Virus species can sit back and relax. In addition, there is a co-evolutionary relationship between virus and resistant cultivars. Resistant cultivars will also face the risk of loss of resistance several years after planting, so whether or not the tomato cultivar we are growing on is against yellow leaf curl virus disease. With resistance, the prevention of yellow leaf curl virus disease can not be ignored, especially the prevention and control of whitefly and other vector insects.
To prevent whitefly and other viral vector insects, vegetable farmers can use 20% or 3 days before planting to use Ruisheng or Aketai and other strong insecticides for irrigation, the effective period of up to 20 days, 20 days after the spray control 1 time. At the same time, 50 mesh or more insect nets were used to physically isolate the plants and pests, and sticky plates were hung on top of the plants for trapping and killing, which could reduce pest infestation. Tomato resistance to chlorotic yellow leaf curl disease has a direct relationship with the growth of plants. Based on reasonable fertilization, the use of plant endogenous hormones for conservation of foliar spray, the amount of mu 3 to 6 grams, can increase plant growth, Increase the resistance to the virus.
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