In 2013, the National Agricultural Technology Extension Service Center organized 60 drug resistance monitoring points in 19 provinces (regions) including Hebei, Shanxi, Jiangsu, Zhejiang and Shandong, respectively, for rice planthopper, stem borer, diamondback moth, beet armyworm, The resistance of major pests such as cotton bollworm and wheat scab was monitored. The results showed that the main pests of rice and vegetables had a significant increase in the level of resistance to common control agents in the field. It is urgent to optimize the control strategies, strengthen scientific use of drugs, do a good job of technical guidance, carry out unified prevention and control, and reduce the risk of pesticide use.
Seven monitoring sites were set up in key wheat producing areas to monitor the resistance of wheat scab strains to carbendazim. The monitoring results showed that the resistant strains mainly occurred in Jiangsu and neighboring provinces, and the resistance of carbendazim in some parts of Jiangsu Province decreased significantly. Therefore, it is recommended to rotate the drug in the carbendazim-resistant area. Different action mechanisms such as cymene and tebuconazole can be used to delay the development of resistance to carbendazim.
Helicoverpa armigera and cotton aphid resistance continue to be high
15 monitoring sites were set up in the cotton area of ​​the Yellow River Basin, the cotton area of ​​the Yangtze River Basin, and the Xinjiang cotton area to monitor the resistance of cotton bollworm population to cyhalothrin, phoxim and transgenic Bt cotton, and to monitor the cotton aphid population against imidacloprid and pyridine. Insecticide, omethoate, beta-cypermethrin resistance.
The results showed that the population of cotton bollworm had a moderate level of resistance to fluclum, and the resistance multiples were more than 10 times; low to moderate level of resistance to phoxim; and resistance to transgenic Bt cotton increased year by year. The cotton aphid population is highly resistant to imidacloprid, acetamiprid and beta-cypermethrin. In some areas, the resistance multiple is more than several thousand times; the oxidation of dimethoate is above medium level.
Expert advice -
Restriction of pyrethroids
Experts suggest that in the control of cotton pests, the use of pyrethroids should be restricted to control cotton bollworms to prevent their resistance from rising; strengthen the population of cotton bollworms in the Xinjiang cotton area with less natural shelters. Resistance monitoring. In the drug strategy of cotton aphid, it is necessary to take active measures such as suspending medication and rotating medicine as much as possible.
Delay the development of its resistance.
Plutella xylostella, beet armyworm, resistance to rapid growth
Establish 16 monitoring sites in key vegetable producing areas to monitor the resistance of Plutella xylostella to chlorantraniliprole, spinosad, chlorfenapyr, indoxacarb, avermectin and beta-cypermethrin, and monitor the bromine of beet armyworm The resistance of nicotinonitrile, indoxacarb, methoxyfenozide, spinosyn, and carbaryl salt was monitored for the resistance of Bemisia tabaci to thiamethoxam, pyripramine, spirotetramat, and cyanamide.
The results showed that the resistance of the commonly used pesticides in the southern vegetable producing areas of Hunan, Guangdong, Hainan and Yunnan was rapidly increased compared with the commonly used pesticides in the northern vegetable producing areas, showing the characteristics of southern heavy and northern light. Plutella xylostella population against avermectin and beta-cypermethrin Both have produced high levels of resistance, and the resistance multiples are more than 200 times; moderate resistance to chlorantraniliprole, spinosad, chlorfenapyr, and indoxacarb. The beet armyworm population produces moderate to above resistance to emamectin, and the resistance multiple is more than 50 times; the resistance level of the new formula B. cerevisiae and spirotetramat has reached a medium level. Level.
Expert advice -
Alternate rotation of different medicaments
Experts believe that the rapid increase in resistance to vegetable pests is largely due to over-medication, random increase in usage and concentration. To this end, it is recommended that the drug use strategy should be adjusted in a timely manner, and different mechanisms of action should be used alternately, especially in Hunan, Guangdong, Yunnan, Hainan, etc., the number of pesticides per season of vegetables should not exceed 1 to delay the resistance. Speed ​​of development. In view of the current high level of resistance to avermectin and beta-cypermethrin in the population of Plutella xylostella in most parts of China, it is recommended to suspend use.
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 populations of the brown planthopper, which were collected from August to September, had more than 30 times the resistance to pymetrozine and thiamethoxam.
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. Bisamide agents such as insect benzamide and fipronilamide produce low to moderate levels of resistance.
Expert advice -
Suspension of control of brown planthopper with imidacloprid and buprofezin
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, attention should be paid to limiting the use times of bisamides, silkworm toxins, avermectins and other agents in the area where resistance is produced, to curb the rapid rise of drug resistance; continue to suspend the use of triazophos Phlegm.
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