Tao Ye A few days ago, the National Agricultural Technology Center announced the results of monitoring the resistance to 13 major pests and diseases, including rice planthoppers, clams, wheat scabs, cotton bollworms, cotton aphids, and diamondback moths, and provided prevention and control countermeasures. And suggestions. Brown planthopper According to the monitoring results of 60 drug resistance monitoring sites in 20 provinces (autonomous regions and municipalities) across the country, the brown planthopper has developed various degrees of resistance to various types of pesticides. Therefore, during the prevention and control of brown planthopper, the emigration area and migration Between regions, between the upper and lower generations of the same region, alternate use, different interaction mechanisms, no cross-resistance of insecticides, to avoid continuous, single medication. In view of the high level of resistance to imidacloprid, thiamethoxam and buprofezin in the brown planthopper, it is recommended that imidacloprid, thiamethoxam, and buprofezin should be used to stop brown planthoppers in all rice areas; strictly limit the number of times that pymetrozine and chlorpyrifos are used to control brown planthoppers. , It is best to use rice once a season; Alternating use of new agents such as nitenpyram, dinotefuran, and floxacillin to delay the development of resistance to N. lugens. Since S. furcifera and N. lugens are usually mixed, and N. lugens has a high level of resistance to buprofezin, it is recommended that the use of buprofezin should be suspended in all rice areas to prevent whitebacked planthoppers and delay their development. II The population of S. insipidus has obvious regional resistance to insecticides, and the resistance to bisamides, avermectin and other agents is increasing. The field efficacy test results in Zhejiang and Jiangxi provinces showed that the bisamides such as chlorantraniliprole, flubenapamide and other bisphosphonates had poorer control effects on S. indica, and the seedling conservation effect was only 20% to 60% after 21 days. In this regard, the number of use of bisamides, avermectins, and other agents should be reduced or limited, and the agents that are exposed to the same mechanism of action for two consecutive generations of selenium exposure should be avoided. Fusarium head blight Resistance to carbendazim by wheat Fusarium graminearum mainly occurred in Jiangsu Province and its neighboring provinces. Compared with 2014, the resistant bacteria in Jiangsu Province has formed an advantage group, and the frequency of resistant strains has a rising tendency. Resistant bacteria are in the whole province. The proportion of pathogenic populations reached more than 60%. It is suggested that different mechanisms of action such as cyanocin and tebuconazole should be used in carbendazim-producing areas to delay the development of resistance to carbendazim by Gibberella zeae. Bollworm Compared with the monitoring results in 2014, the resistance to pyrethroids of pyrethroids increased in most areas. Experts suggest that in regions with high levels of resistance to pyrethroids, particularly in Shandong Province of North China, the use of pyrethroids to control cotton bollworm should be banned in order to delay the increase in insecticide resistance in North China. Districts and Xinjiang cotton regions should limit the number of organophosphorus and emamectin benzoates used, and alternate use of other agents with different mechanisms such as hexaflumuron and indoxacarb. Cotton wool The resistance of cotton aphid to pharmacological agents develops rapidly, and almost all of the currently used pharmacological agents are resistant, especially to pyrethroids, organophosphorus, and neonicotinoids. At present, all delta populations in the monitoring area are at high levels of resistance to deltamethrin and imidacloprid. In some areas, the multiple of resistance reached tens of thousands of times, and there is still an increasing trend. Cotton aphid has become one of the pests with severe drug resistance and difficult to control. It should take active measures such as suspension of medication, alternation of medications, rotation of medications, etc. to avoid continuous use of the same type of pharmaceuticals (especially pyrethroids, neonicotinoids). (Pharmaceuticals) delays the development of resistance. Diamondback moth In view of the high level of resistance to avermectin and beta-cypermethrin in most parts of the country, we should continue to suspend the use of these two agents in the vegetable production areas to control the diamondback moth; chlorantraniliprole and chlorfenapyr The resistance levels of chlorfluazuron and chlorfluazuron differ significantly between the north and the south. Compared with the monitoring results in 2014, the multiples of resistance have increased. It is recommended to continue limiting the number of times it is used in the areas where it is resistant, especially in Hunan. , Guangdong, Yunnan, Hainan, and other re-emerged areas of use of quarterly vegetables no more than 1 times, can alternately use spinosad and other agents with different mechanisms of action. Tao Ye It is noteworthy that the current monitoring of the area of ​​Myzus persicae population on the neonicotinoids imidacloprid, carbamate agents Kang Wei have a high level of resistance, resistance times are more than 100 times; for pyrethroids Bifenthrin is at moderate to high levels of resistance; the novel insecticide flonicamid at moderate to high levels of resistance. Peach aphid has become one of the important insect pests with severe drug resistance and difficult to control. It should take active measures such as suspending drug use, alternation drug use and rotation drug use to avoid continuous use of the same type of drug and delay the development of resistance.
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