Recently, the reporter learned from the National Agricultural Technology Extension Service Center that in 2013, 60 drug resistance monitoring points were passed through 19 provinces (regions) including Hebei, Shanxi, Jiangsu, Zhejiang, Shandong, Henan, Hubei, Hunan, Xinjiang, and Guangdong. The resistance to major rice pests such as rice planthopper and rice stem borer was monitored. The results showed that the main pests of rice had a significant increase in the level of resistance to common control agents in the field. It is urgent to optimize the prevention and control strategies, strengthen scientific use of drugs, do a good job in technical guidance, carry out unified prevention and control, and reduce the risk of pesticide use.
Linyi Fertilizer Network Copyright
It is understood that the resistance of rice brown planthopper and rice stem borer is worrying. 28 monitoring sites were set up in the southern main rice producing provinces to monitor the resistance of the brown planthopper to buprofezin, pymetrozine, thiamethoxam and imidacloprid, and to monitor the antimony to triazophos, chlorpyrifos, insecticide, and chlorella. Amide, fipronilamide resistance. The results showed that most of the monitored populations of the brown planthopper had high level of resistance to imidacloprid and buprofezin. Among them, Guangxi Yongfu population had the highest resistance to imidacloprid, reaching 1287 times, and the Leizhou population in Guangdong had the highest resistance to buprofezin. It reached 711 times; it was moderately resistant to pymetrozine and thiamethoxam, especially the brown planthopper population collected from August to September, and the resistance to pymetrozine and thiamethoxam had reached more than 30 times. The distribution of insecticide resistance in the population of Chilo suppressalis has obvious regional characteristics. The tested populations in Zhejiang, Jiangxi and most areas of Hunan have produced moderate to high levels of resistance to organophosphorus agents such as triazophos and chlorpyrifos. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
According to the results of drug resistance monitoring, in order to slow down the development of pest resistance and improve the control effect, experts suggest that, in view of the brown fly mites, a long-distance migratory pest, in the process of prevention and control, the migration area and the migration interval, the same area Between generations, it is necessary to rotate and alternately use insecticides with different action mechanisms and no cross-resistance to avoid continuous and single medication. According to the results of resistance monitoring, the use of pymetrozine and thiamethoxam to control brown planthopper should be strictly limited. It is best to use rice once a season to prevent the resistance from rising continuously, leading to the loss of control in the control of brown planthopper. The resistance level of buprofezin increased significantly, and most areas have reached high level of resistance. It is recommended that all rice areas temporarily stop using imidacloprid and buprofezin to control brown planthopper. In the prevention and control of Chilo suppressalis, the resistant areas have been noted to limit the use of bisamides, silkworm toxins, avermectins and other agents, to curb the rapid rise of drug resistance; continue to suspend the use of triazophos Phlegm. Linyi Fertilizer Network Copyright
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