Virus disease has a certain incubation period. After the tomato is poisoned, it is prosperous during the fruiting period of flowering. It manifests as symptoms of mosaic, leaf-leaf, fern leaf, and striae, resulting in a significant reduction in yields and even an unacceptable harvest. Adopting the method of plucking the leaves and assisting them with chemicals can delay and inhibit the development of the disease and reduce the loss of production.
Mechanisms Viruses from infected plants can be divided into mature and mature tissue virus, transmission tissue virus and young tissue virus. Mature and mature tissue cells are aging and have isolated and fixed effects on the original virions. Transduction of tissue virus is the most direct source of infection in new shoots. Viruses move with the liquid flow and conduct to the upper tissues. They are new and growing. Tender tissue builds up and proliferates; young tissue is actively dividing and is the main site for proliferation and proliferation of viruses. Therefore, it is believed that by repeatedly hitting the leaves, the number of pathogenic roots of the shoots can be reduced, and the intracellular and intercellular virus concentrations can be reduced. When the virus concentration drops to a certain level, the damage is not likely to occur, which is conducive to maintaining the normal function of the conducting tissues and fostering normal new ones. Tip. The reason why the tip of the shoot is treated with tipping instead of brushing, the first is to maintain the absorption and conduction function of the plant through the growth of new shoots, and the other is to hope that more virions will be concentrated on eradicating the target by strengthening the conduction transport.
The method is suitable for mid-late-maturing varieties because of its long growth period, strong regeneration ability, strong branching force, high branching rate, long branch lengths, and is suitable for topping. Combining the selection and harvesting of the first to third fruits, the old leaves, diseased leaves, diseased branches, and diseased new leaves were destroyed from the base. When the onset of new shoots is 25 centimeters in length, it is removed from the base and the new shoots are left. This is repeated 2 or 3 times until the new shoots grow normally and remain as the resulting mother shoots. When dealing with the onset of new shoots, it was found that the branches were fine when they showed signs of illness. At this time, do not rush to knock them out, let them grow to a certain extent and then deal with them again. After washing hands with disinfectant and water, cut the diseased branches. After the shoots were picked and sprayed, virus inhibitors and acaricidal and acaricidal agents were sprayed, such as virus A20% dodecyl acetate copper wettable powder, imidacloprid, avermectin, etc., and new shoots and new leaves were sprayed.
The effect of the remaining shoots is relatively lower, which inhibits the tendency of the tomatoes to rise too quickly. Compared with spray-only virus passivator, the harvest period was extended by 1 to 2 months. The fruit rate of diseased fruits was reduced by more than 10%, and the number of fruit red ripening days was shortened by 3 to 10 days. The increase rate was more than 30%.
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