Rice yellow leaf disease
The pathogen Rice transitory yellowing virus is called RTYV, and it is called rice yellow leaf virus or temporary virus. It is a virus. The virions are bullet-like or bacillus-like, ranging in size from 120 to 14096 (nm), and they accumulate in the inner and outer membranes of the nucleus, as well as in the nucleus and cytoplasm. The viral passivation temperature was 56-58°C, the dilution limit was 100000-1000000 times, the in vitro survival time was 30°C was 36 hours, and the 0-2°C was 11 days. Viral bodies are often confined to the phloem cells. Transmission routes and onset conditions Yellow leaf disease is transmitted by black-tailed leafhoppers, two-tailed leafhoppers, and two leafhoppers. Can pass on drugs for life, not passing eggs. The virus passed the winter in mediator insects, ratooning rice, and aphrodisiac plants, and spread to early rice in the following year, becoming the primary source of infestation. After harvest, leafhoppers migrated to the second crop rice to be poisoned. After the second crop was harvested, the virus passed winter with host mediators on the winter. The number of mediator insects is high, and the incidence of virus infection is heavy. In general, Japonica rice has less disease than Japonica rice and japonica, and hybrid rice has the best disease resistance. In summer, there is little rain and drought, which promotes the propagation of leafhoppers, which is conducive to feeding activities. It also shortens the cycle and the incubation period, and is conducive to disease epidemics. Ground Chili Powder,Chili Powder,Red Chilli Powder,Red Chile Powder Ningxia Ningyang Halal Food Co., Ltd. , https://www.ningyangfood.com
Prevention methods (1) Strengthen agricultural control, minimize the mixed area of ​​single and double-season rice, and cut off the damage of mediator insects. Deeply to the ground to reduce the overwhelming host and more vertical insect source. Reasonable layout, contiguous planting, planting varieties with similar ripening time as much as possible, reduce mediator transmission and disease transmission. Early sowing is to plant disease-resistant varieties. When harvesting, we must back to cutting rice. (2) Selection of disease resistant varieties such as Bai Shelli, Bo Luo Dwarf, IR29, Xinan Dwarf, and Muquan. (3) Pest control and disease prevention Mediator insects were eliminated Before the virus was transmitted, early rice was transplanted before the winter leafhoppers moved. In the overwintering period of leafhopper migration and rice field generation nymphs hatching control. The double-cropping rice area was controlled before and after a large amount of harvest of early rice and before the migration peak of Yeling. Late rice field, from the true leaves began to pay attention to prevention and control, combined with net capture. In the early days of late rice, the prevention and control of the disease is strengthened, and the interval is 3-5 days. Combination of single and double cropping rice should strengthen prevention and control of early rice. In the early stage of late rice cultivation, pest control should also be strengthened. For the use of agents see rice dwarf disease.