Symptoms mainly occur in the southern region of China. The affected plants were dwarfed and the leaves were discolored and the growth was degraded. The color of the leaves was orange to yellow. Indica is mostly orange or slightly red, and it is also called red leaf disease. Indica is mostly yellow. The leaves are mottled and rusty spots appear on old leaves. East Georgia is a Philippine native saying that it means recession.
The pathogen Rice tungro spherical virus is abbreviated as RTSV, and it is called an East Gruru spherical virus, belonging to the maize chlorotic dwarf virus group. The virions are equidistant isosurfaces, 30-35 nm in size, contain single-stranded ribonucleic acid, and have no envelope outside the granules. Passivation temperature 60 °C, in vitro survival 4 °C conditions 7 days, survival conditions up to 1 month in freezing conditions. In addition, Rice tungro bacilliform virus is abbreviated as RTBV, and it is also known as Tunggro baculovirus, which is also the pathogen of the disease and is often mixed with RTSV. Virus particles are small rods, size 150-35035 (nm). Is a duck plague yellow yellow mottle virus group.
Transmission routes and disease conditions Viruses are produced in a semi-persistent manner by Nephotettix impictceps, two-tailed leafhoppers, black leafhoppers, etc.
The spread, contact or sap friction did not spread, and the shortest time for poisoning or inoculation was 2 minutes and 15 minutes, respectively. Subsequent to 6-7 days of post-intoxication, the symptoms are apparent. The disease is not obvious in the body of insects. The time for virus transmission is 5-7 days, and it is no longer transmitted after 7 days. The virus transmission rate of the two small leafhoppers is very high. The transmission rate of other leafhoppers is not high, and some virus transmissions are not transmitted. The disease resistance of different leafhoppers varies.
Control methods (1) selection of disease-resistant varieties. (2) In areas with severe disease, attention should be paid to the prevention and control of secondary mediators, such as leafhoppers, to reduce their risk of transmission. Specific methods see rice Verticillium wilt.
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