Symptoms are commonly called "dwarf rice." The main symptoms were increased tiller, short broad leaves, stiff leaves, dark green leaves, white veins and stalks on the back of the leaves, waxy white on the back of the leaves, and short, knob-like uplifts that turned brown, with no heading or spikes, and poor fruiting. Symptoms of infection at different stages of life are slightly different. At the seedling stage, the heart leaves grow slowly, and the leaves are short, wide, stiff, and dark green. The veins have irregular waxy white knobs that turn dark brown. The roots are short, the plants are short and do not head, often withering early. Newborn childbirth at the time of childbirth was the first manifestation of childbirth, and short stems were still extracted from the main stem and early tillers, but the ear was retracted in the sheath. In the jointing stage, the flag leaves are short and wide, with short head and neck shortening and low seed setting rate. There are short strips of knobs on the dorsal and stalks.
The pathogen Rice black streaked dwarf virus is abbreviated as RBSDV, which is called the rice black streak dwarf virus and belongs to the plant reovirus group. The virus particles are spherical symmetric polyhedrons with a size of 75-80 nm. Virus particles have two layers inside and outside the capsid. Viral particles in the cytoplasm exist in three forms: one is scattered or irregularly aggregated, the other is a regular crystalline arrangement, and another type of virus particle is arranged in a string, and the outer layer of the membrane is in the form of a pod, sheath, or Tubular construction. The virus passivation temperature is 50-60°C, the disease leaf sap dilution point is 10000-10000 times, and the disease leaf juice sap is 5-6 days in vitro.
Transmission routes and disease conditions Rice black-streaked dwarf virus is responsible for more than 20 species of host plants such as rice, barley, wheat, corn, sorghum, millet, barnyardgrass, amature, and setaria. The virus is only transmitted by the insects such as SBPH, white-backed planthoppers, and leucorrhizal migratory locusts. Among them, mainly transmitted by SBPH. Once the mediator is exposed to drugs, it is poisonous for life but it is not transmitted by eggs. The virus is mainly wintered on barley and wheat diseased plants, and some of them are also wintering in the body of SBPH. The first generation of Laodelphax striatus was transmitted to early rice, single-season rice, late rice, and green corn after being infected by diseased wheat. The second and third generations of SBPHs in the paddy fields were infected with rice and infected with late rice and autumn corn. The adults of Laodelphax striatellus and overwintering nymphs passed through the late rice and transmitted the virus to barley. wheat. Since SBPH could not reproduce on corn, corn had little effect on reinfection of the virus. The field virus completes the infestation cycle through the wheat-early rice-late rice approach. The shortest time for obtaining SBPH is 30 minutes, and 1-2 days can fully obtain the virus. The virus in the body of Laodelphax striatellus is 8-35 days. Only 1 minute to take the drug. The incubation period of rice plants was 14-24 days after receiving the virus. Late rice early sowing is heavier than late sowing, and young rice seedlings are more severe. The incidence of barley and wheat is light and heavy, and the number of sources of poisoning determines the incidence of rice.
Prevention methods (1) Reasonable layout, contiguous planting, and simultaneous transplanting. Remove the weeds in the field and suppress the insect and poison sources. (2) pest control and disease prevention. Pay attention to the prevention and control of Putian and Honda, and pay attention to pest control in wheat fields. Grasping a generation of adults from the wheat fields to the rice fields and the second and third generations of adults moved from early rice to the late rice fields and corn, and the last adult and winter nymphs moved from late rice to early sowing and control of wheat fields.
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