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The pathogenesis of Chinese cabbage virus disease
The pathogenesis of Chinese cabbage virus disease: the virus inactivation temperature is 55-60 ° C, the dilution end point is 2000-5000 times, the in vitro poisoning period is 24-96 hours, and the granules are linear. The incubation period is 9-14 days. Generally, the temperature is around 25 °C, the illumination time is long, and the incubation period is short; the temperature is lower than 15 °C, the incubation period is long, and sometimes it is hidden. The virus can be overwintered on cabbage, cabbage, radish and other seed-growing plants. It can also be wintered in the roots of perennial crops such as spinach and field-side host weeds. In areas where cruciferous vegetables are grown all year round, the virus does not have wintering problems. Turnip mosaic virus and cucumber mosaic virus are transmitted by aphids and sap, but the field is mainly aphids (cabbage, peach aphid, cabbage, cotton aphid), and the seeds are not poisonous. Tobacco mosaic virus aphids cannot be poisoned, and the field is mainly infected by juice. Chinese cabbage has a very narrow range of temperature adaptation, and the fertility temperature is 18-21 ° C, and 25 ° C is the upper temperature limit. It is not premature to broadcast Chinese cabbage in autumn in central China. The seedling stage is at high temperature. In addition to unfavorable seedling growth and weakening of disease resistance, due to the climate drought, aphids are alive, the density of insect population is large, and virus disease is easily induced, often causing serious losses. No replay is done.
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