Symptoms The appearance of chlorotic yellow and white spots on the base of the heart leaves at the seedling stage, followed by expansion into yellow stripes parallel to the veins, remains green between the stripes. Different varieties showed different performances. The yellow, white, soft, curled drooping, and dry-heart-shaped hearts of the indica, japonica and high-grass japonica rice. Dwarf japonica rice did not show a dead heart, yellow and green stripes appeared, the tillers decreased, and diseased plants withered earlier. The dead heart seedling caused by virus disease is similar to the dead heart seedling caused by the infestation of rice stem borer, but it has no borehole, no insect feces, and is not easy to pull up, unlike the dead heart seedling caused by the infestation of earthworms. The onset of childbirth begins with a chlorotic macular spot on the base of the next leaf of the heart, which then spreads to form irregular yellow-white streaks. The old leaf is not significantly affected. Indica rice varieties do not dry, and indica rice varieties show dry heart. The diseased plants usually withered or the spikelets were not true. After the jointing, yellow-green stripes appeared on the lower part of the flag leaves, and all types of rice were not dry, but heading malformation was rarely found. The pathogenic Rice stipe virus is abbreviated as RSV, and the rice stripe virus is a virus belonging to the rice stripe virus group (or the Roux virus group). Viral particles are filamentous, 4008nm in size, dispersed in the cytoplasm, vacuoles and nucleus, or in amorphous aggregates such as granules, sand, etc., that is, inclusion bodies. It seems that many filamentous bodies are entangled into a group. Diseased leaf sap dilution limit 1000-10000 times, passivation temperature of 55 °C 3 minutes, minus 20 °C, in vitro virus protection period (sick rice) 8 months. Transmission routes and onset conditions The virus is transmitted only by mediator insects, and other pathways do not transmit disease. Mediator insects are mainly Laodelphax striatellus. Once acquired, they can live for life and transmit viruses via eggs. As far as the white-fly locusts are transmitted in nature, they have little effect. The shortest drug use time is 10 minutes, and the return period is 4-23 days, usually 10-15 days. The virus proliferates in the body and can also be transmitted via the egg. The virus infests rice, wheat, barley, oats, corn, millet, alfalfa, aegis, and setaria There are more than 50 kinds of plants. However, except for rice, other hosts have little effect on the infection cycle. The virus was overwintering in the poisonous ash fly and became the main primary infestation source. The winter nymphs in large and small wheat fields breed in the original wheat field after emergence, and then move to early rice fields or Honda to poison and reproduce. After the early rice is harvested, it moves to the late rice and damages. After the late rice is harvested, it is relocated to the winter wheat. Wintering. Rice is susceptible to disease from the seedling stage to the tillering stage. The long leaf-age incubation period is also longer, and it gradually increases with plant life and resistance. The occurrence of stripe leaf blight is directly related to the occurrence of Laodelphax striatellus and the rate of insects and insects. The temperature in spring is high, rainfall is low, and the population of insects is heavy. The occurrence of disease in the two cropping areas of rice and wheat is heavy, and the diseases in barley and double cropping rice areas are light. Control methods (1) Adjust the farming system and crop layout in rice fields. Planting and planting in order to prevent the transfer of disease in different seasons, different ripening periods and between early and late crops. Avoid botanical fields, and don't be in the middle of fields. (2) Planting resistant (resistant) varieties. In accordance with local conditions, China 91, Xudao No. 2, Yuanfu No. 2, Yanjing No. 20, and Tieguifeng were selected. (3) Adjust the sowing date and avoid the migration period of Laodelphax striatellus during the transplanting period. Harvesting wheat and early rice should move back to Putian and Daejeon rice seedlings to reduce the migration of spurs. Strengthen management to promote childbirth. (4) Insect prevention and disease prevention, grasping the centralized prevention and control of pre-drug transfer and migration, and the prevention and control methods refer to Sphaeroprostaxis.
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