Active prevention and control of rice stripe disease and black streaked dwarf disease

Comprehensive analysis of the mid-May wheat field scale, the development schedule, the overwintering rate of the hoppers and the resistance of rice varieties, and other factors are expected to cause moderate to severe occurrence of rice black streaked dwarf disease in the province this year. Blight disease happens lightly and local partiality occurs. The occurrence range of southern rice black streaked dwarf disease, which is spread by whitebacked planthoppers, will be significantly expanded. All localities must implement the principle of "giving priority to prevention and comprehensive prevention and control," and vigorously control the prevention and control of two viral diseases, rice stripe disease and black-streaked dwarf disease.
According to the census conducted in mid-May in the mid-May census, the number of gray-fly maggots in wheat fields ranges from 50,000 to 300,000, and the amount of worms in parts of southern Jiangsu, Yanjiang River, Lixia River, coastal areas and Huaibei reaches 300,000. ~1 million heads, and some acres of wheat in the Huaibei and Huaibei rice fields amount to 1 million to 3.2 million heads. The amount of insects in parts of southern Jiangsu, Huaihuai and Huaibei was 15%-70% lower than that of the same period of last year, ranking the eighth place since 2004; most other areas were 60%-300% higher than the same period of last year, ranking third since 2004. Around.
The recent detection of the rate of poisoning of Laodelphax striatellus in the 33 provinces across the province averaged 7.28% for the wintering generation of S. pulcherrima, which was 7.28% lower than last year's 7.7%, and still exceeded 12% of pandemic in parts along the Yangtze River and southern Jiangsu. Indicators; Measured 23 typical areas overwintering Laodelphax striatellus black-streaked dwarf virus infection rate of an average of 4.74%, lower than last year's 9.9%, but the area along the river, the virus rate is still up to 10% to 17%.
Varieties resistant to southern China's southern Jiangsu Province, along the Yangtze River, and the eastern coast, have a high proportion of rice varieties with stripe disease. The main rice cultivars in our province are not resistant to black streaked dwarf disease, especially in Huaibei, coastal and other places with high cultivars. No rice varieties resistant to white backed planthoppers and southern rice black stripe dwarf disease have been found in China.
The results showed that the rice susceptibility period coincided with that of a generation of Laodelphax striatellus. The recent development of the development of Spodoptera frugiperda in the wheat field was mainly based on 1 to 2 instar nymphs in northern Jiangsu, and 2 to 3 instar nymphs in Su'nan and Suzhong. The progress is about 5 days earlier than last year, which is similar to the average year. It is estimated that the emergence of a generation of adult emergence will occur in late May and the migration will last until mid-June. From late May to mid-June this year, most rice in our province is in the stage of emergence to delivery of susceptible virus disease, which is in line with the migration peak period of a generation of SBPH.
Comprehensive prevention and control measures shall adopt the comprehensive prevention and control measures of "resistance, avoidance, cutting off, and cure" against rice black stripe dwarf disease and stripe leaf blight. (1) Promote the planting of resistant varieties. Combining the implementation of "three reforms and one creation", promote "mutation of oysters", compress the area of ​​high-risk black-streaked dwarf disease japonica rice varieties, and promote the cultivation of high-quality, disease-resistant japonica rice varieties. In the mixed area of ​​stripe leaf blight and black streaky dwarf disease, rice varieties with high resistance to stripe blight and black streaky dwarf disease should be selected. (2) Late broadcast for appropriate period. Promotion of machine seedlings, seedlings, and other seedlings are conducive to moderately postponing the planting method of the sowing period, compressing early sowing and early planting areas, and avoiding the generation of Laodelphax striatellus to move into the peak period of Putian. (3) Promote Putian to cover insect nets or non-woven fabrics. For areas with large planting transplanting area and high incidence of rice planthoppers, stripe leaf blight, or black-streaked dwarf disease-susceptible varieties, rice should be planted with more than 20 mesh insect repellent nets or 15 to 20 g/m2 after sowing. Nonwovens cover Putian all the time, preventing Laodelphax from moving into poison. (4) Scientifically controlling SBPH. We will focus on the prevention and control of Laodelphax striatellus during the peak period of young nymphs of the wheat field, the migration of the adult Laodelphax striatellus, and the second and third generations of nymphs in Datian. In the field of Putian, the conventional hydroponic field began to use pesticides from the seedlings, and the machine was transplanted into the fields. Immediately after uncovering the non-woven fabrics, the drugs were used. After water transplanting and machine transplanting, 2 to 3 days prior to transplanting, the “supplying herbs” was used to achieve drug transfer. plant. In the field stage, the machine is used to insert rice live plants, and the direct-seeded rice is applied once in the 2 to 3 leaf stage. In the third generation of the nymph of the rice planthopper, the insecticide is applied to the standard plots in combination with rice leaffolders, rice planthoppers and aphids. Prevention. According to the resistance of rice varieties, sowing methods, with the amount of insects, determine the interval between the use of drugs and the number of control. The use of pymetrozine, isoprocarb, Daofeng powder, dichlorvos, and other drugs can be used, and the use of drugs with good persistence and fast-acting good drugs should be used. Attention should be paid to alternate medications to delay the drug resistance of Laodelphax striatellus.
For southern rice black-streaked dwarf disease, it is necessary to adhere to the "pest control disease control" strategy and scientifically control the white-backed planthoppers. In order to move to the source of insects and move into the peak period as the main target and control the appropriate period of time, timely control of the whitebacked planthopper in the standard field, reduce the amount of mediators transmitted, reduce the risk of transmission. The use of pymetrozine, thiamethoxam, buprofezin, isoprocarb, ethiprole, thiamethoxam and other high-efficiency, low-toxic single agents and their mixed agents can be used to demonstrate nitenpyram in control of whitebacked planthoppers and persist. Good efficacy and fast-acting drugs are used together. Infected rice fields can also be treated with antiviral agents such as fluorophosphorus, high-sensitivity proteins, and Bicao 0.136% erythromycin Ethyl WP, and foliar fertilizers can be sprayed to increase the disease resistance of rice.

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