In 2016, the National Agricultural Technology Center organized 60 drug resistance monitoring points in 20 provinces (autonomous regions and municipalities), 11 species including rice planthopper, rice stem borer, wheat scab, cotton bollworm, cotton aphid and whitefly. The resistance of major pests and diseases was monitored.
The results showed that the resistance of some pests to the commonly used control agents in the field increased significantly. Which medicines do not work for pests and diseases? How to use drugs to delay drug resistance? Let's take a look at the scientific drug countermeasures given by Zhang Shuai, a senior agronomist at the National Agricultural Technology Center.
At present, all populations of the brown planthopper have a high level of resistance to the first-generation neonicotinoid imidacloprid (more than 1200 times resistance), and also a high second-generation neonicotinoid thiamethoxam. Horizontal resistance (resistance multiples 200 to 500 times), but sensitive to moderate levels of resistance to nitenpyram; low to moderate levels of resistance to the third generation neonicotinoid dinotefuramide.
Brown planthopper has different degrees of resistance to various insecticides . Therefore, in the control process of brown planthopper, between the migration area and the immigration area, the different mechanisms of action should be alternated and rotated between the upper and lower generations of the same area. Non-resistance insecticides, avoiding continuous, single use. In view of the fact that the brown planthopper has reached high level of resistance to imidacloprid, thiamethoxam and buprofezin, it is recommended to suspend the use of imidacloprid, thiamethoxam and buprofezin to control brown planthopper in various rice areas; strictly limit the use of pymetrozine and chlorpyrifos to control brown planthopper It is best to use rice once a season; alternately use new agents such as nitenpyram, dinotefuran, trifluoropyrimidine to delay the development of resistance to brown planthopper.
White backed stork
At present, the population of the whitebacked planthopper is moderately to high level resistant to buprofezin and chlorpyrifos; the neonicotinoids imidacloprid and thiamethoxam are sensitive to low level. Compared with 2015, the overall resistance of whitebacked planthoppers to various types of pharmaceuticals is increasing.
In view of the fact that the whitebacked planthopper and the brown planthopper are usually mixed, and the brown planthopper has a high level of resistance to buprofezin, it is recommended that the rice areas be suspended from the use of buprofezin to control the whitebacked planthopper, and the resistance will continue to develop. At the same time, because the virulence of neonicotinoids to the whitebacked planthopper is still very high, it can be considered to use imidacloprid, thiamethoxam or fluramide in the field of rice planthoppers in the field. Anthrone is used alternately for control.
The use of carbendazim in Jiangsu and other places is less effective. The results of resistance monitoring showed that the resistance of Phytophthora to carbendazim mainly occurred in Jiangsu Province and its surrounding provinces, and the degree of drug resistance reached the dangerous level detectable by conventional methods. The effect of fungicide against scab is very poor.
It is recommended to use different action mechanism agents such as cylamellide and tebuconazole in the carbendazim-resistant areas to delay the development of resistance.
Need to rotate medication to delay the development of resistance. At present, the population of the long-spotted scorpion in the monitoring area is sensitive to the common drugs such as imidacloprid, acetamiprid, fluramide, organophosphorus omethoate, carbamate anti-carboside, pyrethroid-based beta-cypermethrin. status. The sensitivity of the Phytophthora sinensis to the medicinal agents in the different locations was larger than that of the wheat genus, and the populations of Dongtai and Henan Zhumadian were detected to have low to moderate levels of resistance to imidacloprid; the population of Henan Zhumadian was monitored to be highly efficient. Cypermethrin produces moderate levels of resistance; it is sensitive to agents such as fluazimidamine, acetamiprid, carbaryl, and omethoate.
It is suggested to use different mechanisms of action such as neonicotinoids and anti-procarb in the resistant areas of wheat bran to delay the development of resistance to wheat bran.
Pyrethroids should be banned in the North China cotton region. It was observed that the populations of Wangjiang, Jingzhou and Zaoyang in Anhui Province were low-level resistant to pyrethroids, and other populations were at moderate to high level, especially in Qiu County of Hebei Province and Anyang of Henan Province. Shandong Binzhou and Xiajin populations produced high levels of resistance to cyhalothrin (resistance multiples 129 to 166 times).
In areas where high resistance of pyrethroids to pyrethroids, especially in North China, it is forbidden to use pyrethroids to control cotton bollworms to delay their resistance; in the cotton areas of North China and the Yangtze River To limit the use of organophosphorus and macrolides (no more than 2 times in the cotton growing season), other agents with different mechanisms of action such as spinosad, chlorantraniliprole, etc. can be alternately rotated.
All populations are at high levels of resistance to deltamethrin and imidacloprid. At present, all populations of cotton aphid in the monitored area are highly resistant to pyrethroids such as deltamethrin and neonicotinoid imidacloprid. In some areas, the resistance multiples have reached tens of thousands of times (multiple resistance to deltamethrin) >4545 times, the resistance to imidacloprid is 188-316402 times); the carbamate butyl thiocarbamate is moderately to high level resistant; the organophosphorus oxidized dimethoate is moderately resistant.
The resistance of cotton aphid to medicinal development is relatively fast, and it has almost resistance to all the agents currently used, especially for pyrethroids, carbamates, and neonicotinoids. And there is still an increasing trend.
Aphis gossypii has become one of the most resistant and difficult to control pests. It is recommended to suspend the use of deltamethrin, butyl thiocarbazone, imidacloprid and other agents in agricultural production, and choose other drugs with different mechanisms of action for prevention and control. Comprehensive management measures to achieve better control results.
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