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Four measures for preventing and controlling rice stripe disease
According to the comprehensive analysis of the related factors of the current epidemic of rice stripe disease, rice stripe disease this year will be a very popular trend, the epidemic exceeds last year, the situation is very grim. First, the amount of gray fly locust is high. Since the weather conditions in the winter and the spring are very conducive to the proliferation of the planthoppers, this year, the volume of fly hoppers is particularly high. In most areas of Jiangsu Province, the population of rice stripe disease is 200,000 or more, which is 1-3 times higher than the pandemic in the same period of last year. The highest amount of rice and insects in Huishan District of Wuxi City is the highest. There were 18 million heads, some 8.4 million heads in Jianhu County, 5.598 million heads in some fields in Changshu City, and 3.6 million in some fields in Sihong County, which were 10 times more than in the same period of last year. Second, the rate of poisoning of Laodelphax striatellus is high. The province's weighted average was 31.3%, 5.9 percentage points higher than the previous year, and the highest area was 58%, which is much higher than the 12% pandemic index. The third is the large area of ​​susceptible species. Although crops with lesser incidence of stripe blight disease were expanded last year in some parts of Central Jiangsu and northern Jiangsu, due to the fact that there are few varieties with strong resistance and good comprehensive traits, most varieties used in production are still susceptible varieties. According to preliminary statistics, the cultivated area of ​​susceptible varieties of rice in the province will reach 18.40 million mu, accounting for 60% of the total rice area. The Jiangsu Provincial Department of Agriculture and Forestry paid great attention to the prevention and control of rice stripe disease, and the province's plant protection work conference and the province's spring agricultural production site will be specifically deployed for the prevention and control work. In response to the current stringent situation of the rice stripe blight epidemic, in order to effectively win the active battle of prevention and control, we will focus on the following measures: 1. Grasp the wheat planthoppers in the wheat field. Fenvalerate, beta-cypermethrin, etc. spray water, or poison soil with dichlorvos. Second, vigorously promote rice soaking with pesticide imidacloprid or fipronil seed soaking, control of early migration into the field of Laodelphax striatellus transmission hazards. The conditions in areas such as South Jiangsu and Yanjiang have postponed the date of sowing until after May 20, avoiding the generation of Laodelphax striatellus to migrate to the peak, and postponed the transplanting period until around June 20 to reduce the number of second-generation occurrences. Third, pay close attention to the control of planthoppers in Putian stage. During the period when the adults of the planthopper population migrated to Dianchi Lake, immediately select effective pesticides such as imidacloprid or fipronil and fast-acting pesticides such as dichlorvos, chlorimicarb, After the prevention and control of isoprocarb, fast-killing, etc., they are controlled 1 to 2 times every 3 to 5 days depending on the pest situation. 2 to 3 days before transplanting, use good delivery of herbs, so that transplanting with drugs. Actively demonstrate and popularize physical control measures such as insect-proof nets and non-woven fabrics in areas where conditions permit, and protect seedlings from the harmful effects of SBPH. Fourth, pay attention to Honda control of planthoppers in the second and third generations of the egg hatching peaks to the youngest nymphs during the peak period of prevention and control, with imidacloprid or fipronil and other agents on the water spray. At the same time, we should clean the pastoral areas, strengthen the control of farmland and “four-sided†weeds, improve the living environment of Laodelphax striatellus, and reduce the transmission of poisonous insects. Author: Jiangsu Provincial Bureau of Agriculture and Forestry Plant Protection Station