Resistance to some pests in paddy fields has risen significantly
In 2016, the National Agricultural Technology Center organized monitoring at 60 drug-resistance monitoring sites in 20 provinces (autonomous regions and municipalities) and found that brown planthoppers in rice fields had different levels of resistance to various types of insecticides. The agents such as buprofezin and chlorpyrifos are at moderate to high levels of resistance.
All populations of the brown planthopper in the brown planthopper monitored in the region have a high level of resistance to imidacloprid (more than 1200 times resistance), and also produce high levels of resistance to thiamethoxam (200-500 times resistance), but only Acetamiprid is sensitive to moderate levels of resistance; it is resistant to dinotefuran at low to moderate levels. A high level of resistance to buprofezin (multiple of resistance times 500-fold) was observed. Compared with 2015, the resistance to buprofezin of the brown planthopper increased significantly. In particular, the resistance multiples of brown planthopper were found in Jiangsu, Jiangxi, and Hubei. 1,000 times more. A moderate level of resistance to chlorpyrifos. According to plant protection stations in Zhejiang, Jiangxi and Hunan provinces, due to the use of pymetrozine for a number of years, the difference in mortality between the high and low concentrations of N. lugens was very small, and no resistance multiples could be calculated, indicating that the current level of resistance to pymetrozine continues to rise. , should cause great concern.
Countermeasures and suggestions: Nilaparvata lugens has various degrees of resistance to various insecticides. Therefore, during the prevention and control of brown planthopper, between the emigration area and the emigration area, between the upper and lower generations of the same area, the rotation and use should be different. Mechanism of action, no cross-resistance of insecticides, avoiding continuous, single-use 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 every season; alternation use of nitenpyram, dinotefuran, trifluoropyrimidine and other new agents to delay the development of resistance to brown planthopper.
The white backed planthopper population in the current monitoring area of ​​the whitebacked planthopper population is resistant to moderate to high levels of buprofezin and chlorpyrifos; it is sensitive to low levels of resistance to imidacloprid and thiamethoxam. Compared with 2015, the overall increase in the resistance level of whitebacked planthoppers to various types of pesticides was significant.
Countermeasures and suggestions: In view of the common occurrence of whitebacked planthoppers and brown planthoppers, and N. lugens has already produced high levels 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. At the same time, because the virulence of imidacloprid and thiamethoxam against whitebacked planthoppers is still very high, we can consider the use of imidacloprid, thiamethoxam, or flonicamid and pyridoxine in the field of rice planthoppers. Ketones are used interchangeably.
Laodelphax striatellus populations in the middle and lower reaches of the Yangtze River (Jiangsu, Anhui, and Zhejiang provinces) are sensitive to thiamethoxam, nitenpyram, and pymetrozine; and are moderately resistant to chlorpyrifos, compared with 2015. Compared with the monitoring results, most of the populations of Laodelphax striatus have a reduced resistance to chlorpyrifos.
Countermeasures and suggestions: In the future, the number of use of chlorpyrifos should continue to be limited and alternated with thiamethoxam, nitenpyram or pymetrozine to delay the development of resistance.
The population of S. indica in the eastern coastal areas of Zhejiang, the Huaiyang Poyang Lake region, and the southern region of Hunan Province has higher levels of bis-amidicides, chlorantraniliprole, and they are at a moderate level of resistance, compared with the overall resistance multiple of 2015. Increased. At present, the monitoring population in the area of ​​S. insipidus populations is at a moderate level of resistance to the macrolide drug avermectin. Compared with 2015, the resistance rate of most of the CS populations has increased significantly, especially in Zhejiang. In Hunan, the population resistance of S. indica population is more than 50 times. In the regions of Zhejiang, Jiangxi, Hunan and other regions, the chlorpyrifos and triazophos have low to moderate levels of resistance, and the populations of stem borers of Jiangsu, Anhui and Hubei are sensitive to low levels of chlorpyrifos and triazophos.
Countermeasures and suggestions: The population of S. insipidus has obvious regional resistance to insecticides. Among them, most areas in Zhejiang, Jiangxi, and Hunan should continue to limit the use of bisamides and macrolides in the future to avoid SARS. Agents that have contacted the same mechanism of action for successive generations. At the same time, excessive use of avermectin should be controlled to reduce the killing effect on natural enemies.
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