Rice stripe disease is a viral disease transmitted by Laodelphax striatellus, commonly known as cancer on rice. Once the disease is difficult to control, it has a great impact on rice production.
In the early stage of rice stripe disease, the leaves of the diseased plants showed intermittent yellow-green or yellow-white short streaks along the veins. After the lesions were enlarged, more than half of the diseased leaves turned yellow-white, but at the edge. Some still show chlorotic short streaks. The symptoms of different varieties are different: the heart, leaves of glutinous rice, japonica rice and high-stalked japonica rice are slender, soft, and curled and drooping to form a "fake heart" shape; dwarf glutinous rice is not heart-shaped, heart leaves are unfolded, yellow-green stripes appear, and tillers cut back. Early onset plants die, and there are chlorotic spots on the leaves or sheaths in the late onset, but the heading is poor or the deformity is not true, forming "false white ears". The dead heart disease caused by the virus disease is similar to the dead heart seedling caused by the mites, but there is no sputum, no worms, and it is difficult to pull up. Linyi Fertilizer Network Copyright
The pathogen of rice stripe disease is rice stripe virus, which has a wide range of hosts. The virus is transmitted only by mediators, and once it is poisoned, it can be used for life and through eggs. The virus overwinters in the toxic fly ash, which is the main source of initial infection of rice. The latency of rice stripe disease in rice plants is closely related to the temperature and the growth period of rice. The temperature is higher. Before the tillering stage, the incubation period is shorter. Under normal circumstances, the incubation period is 13~17 days. The occurrence and occurrence of rice stripe disease is directly related to the occurrence of Laodelphax striatellus, the rate of poisonous insects, the cultivation of rice susceptible varieties, and the cultivation system suitable for drug transmission. Linyi Fertilizer Network Copyright
The main prevention methods are: Linyi Fertilizer Network Copyright
1. Selection of resistant and disease-resistant varieties: At present, there are few varieties with good resistance and comprehensive traits in production. There should be two points in selecting resistant varieties: First, try to select varieties with good resistance and comprehensive traits. It is appropriate to use disease-resistant varieties in the re-issuing area, and to do a good job in the prevention and control of other pests and diseases. Linyi Fertilizer Network Copyright
2. Strengthening field management: The host of Laodelphax striatellus is mainly gramineous crops and grass weeds. The source of the gray locusts on the weeds in the paddy fields and rice fields will continue to move into the fields for poisoning. Therefore, it is necessary to prevent them. Weeds in the fields and in the rice fields, cut off the bridges of the gray planthoppers, reduce the occurrence of the gray planthoppers, and reduce the early onset. In the field, the diseased seedlings should be pulled out in time, brought out of the field, and destroyed centrally. It is also possible to prevent the gray planthopper from damaging rice seedlings by covering the insect net. Linyi Fertilizer Network Copyright
3. Seed treatment: Seeds such as imidacloprid may be added to the medicament at the same time as conventional seed treatment. Linyi Fertilizer Network Copyright
4. Timely application of drug protection: can be applied at the peak of the gray planthopper, 5% buprofezin wettable powder 40~50g or 25% thiazide·isoprocarb WP 100g or 25% imidacloprid 20~30g Spray with water, you can also use 25% pymetrozine suspension 1500 ~ 2000 times liquid spray. In the field, rice stripe disease is found in the field. In the early stage, some anti-virus agents can be used to delay the onset of the disease. Linyi Fertilizer Network Copyright
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