The symptoms are mainly distributed in the southern rice area. Also known as rice dwarf disease, Pu dwarf, dwarf and so on. When the rice is susceptible to the disease from the seedling stage to the tillering stage, the plants are dwarfed, the tillers are increased, the leaves are dark green, and the leaves are stiff. There are two types of diseased leaf symptoms. The white point type appears on the leaf blade or leaf sheath with dotted yellow-white dotted strips parallel to the veins, most prominent at the base. Above the diseased leaves, new leaves appeared, and the following old leaves did not appear. Twisted type Under the condition of insufficient illumination, the heart leaves are distorted, with the leaves spreading, the edges of the leaves appear undulating and the color is light yellow. At the booting stage, white flag spots appeared on the flag leaf blades and sheaths, and the head and neck were shortened to form a neck or a semi-enveloped spike.

The disease Rice dwarf virus is abbreviated as RDV, and it is called rice dwarf virus and belongs to the plant reovirus group. The virion is a spherical polyhedron with a symmetric diameter of 75 nm and contains double-stranded RNA in the granules. The virus was inactivated at a temperature of 40-45°C, with a dilution point of 1000-100000 times and an in vitro survival period of 48 hours. Buccal granules are mostly concentrated in the chlorosis part of diseased leaves. In the white-spotted leaf cells, X-body containing near-spherical ghosts is contained.

Transmission routes and disease conditions The virus can be transmitted by the leafhoppers, two leafhoppers and leafhoppers. The main species is black-tailed leafhoppers. The infected leafhopper can transmit virus for life and can be transmitted through eggs. Black-tailed leafhoppers sweat-absorbed on rice

minute. After receiving the virus, it is necessary to undergo a period of circulation to pass the virus. The period of return at 20°C is 17 days, and the time at 29.2°C is 12.4 days. After a period of incubation, rice is affected by a period of incubation. The seedling temperature is 22.6°C, the incubation period is 11-24 days, and 28°C is 6-13. The incubation period from the seedling stage to the tillering stage is short, and the subsequent incubation period is short. Increase and increase. The virus is overwintering in the black-tailed leafhopper. Black-tailed leafhoppers pass winter as nymphs on apium, and return to rice fields as a result of late spring emergence. After early rice is harvested, it is moved to late rice. After the late rice is harvested, it is relocated to see maimai. 38 species of grasses such as winter rice were wintered. Poisoning is the main factor affecting the occurrence of the disease. Rice is susceptible to disease before delivery. Warm winter and spring drought is conducive to disease. Rice seedlings are tender, and the source of insects is heavy.

Control methods (1) Selection of resistant (resistant) varieties such as International 26 and so on. (2) It is necessary to grow into a piece to prevent the infection of leafhoppers in early and late rice and different ripe varieties. Early harvest of early rice to prevent insects from migrating to late rice. Harvest to back late rice. (3) Strengthen management, promote early onset of rice seedlings, and increase disease resistance. (4) Promoting chemical weeding, eradicating weeds and other weeds, and suppressing overwhelming insect sources. (5) pest control and disease prevention. Timely prevention and control of the first generation of nymphs breeding in rice fields, and to seize the peak period of the black-tailed leafhoppers migrating the double-season rice fields Putian and Honda, the eradication of the source before the transmission of poison. Can use 25% buprofezin WP, every 667m 225g or 35% speed net emulsion 100ml, 25% speed WP 100g, spray 50L of water, every 3-5 days, even defense 1-3 Times.

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