It takes a long time for the drug to be resistant, which is not only for plants, but also for people. Today, the pesticides are simple to summarize the resistance of pests and diseases .
The resistance of pests and weeds has genetic characteristics, which is manifested by an increase in resistance to a certain dose of a certain agent, that is, the ability to tolerate the dose of most normal individuals in the same sensitive population. Usually the most troublesome problem for the people is that the pests and diseases have developed resistance. Today, we will explain in detail the pests and diseases that are prone to resistance.
There is a difference in resistance to pesticides between different individuals in the natural population of insects. In general, the resistance is extremely low or very low. Under the choice of pesticides, more sensitive individuals are killed, while individuals with strong resistance are retained. After such a certain period of time, when the pest's tolerance to the agent develops beyond the highest tolerance of naturally occurring, we say that drug resistance has formed.
At present, the most resistant species of vegetable pests are Plutella xylostella, Spodoptera exigua, Helicoverpa armigera, etc. Other resistant pests include peach aphid, thrips, spider mites, red spiders, yellow curved beetles, and tobacco budworms. , pod wild beetle, Spodoptera litura, sassafras and so on. The most susceptible to resistance is the pyrethroid insecticide , and the name of the drug is often a certain pyrethroid. Carbamate insecticides, the name of the agent often carries a "wei" word. Insect growth regulators and organophosphorus pesticides, the name of the agent often carries a "phosphorus" word, as well as the vast majority of acaricides. Among them, pyrethroid insecticides, insect growth regulators and acaricides are more resistant and more resistant.
For fungicides, the most susceptible classes include benzimidazoles, including carbendazim, thiophanate-methyl, thiabendazole, and benomyl. Phenyl amides, including metalaxyl and vesyl cream. The methoxy acrylates include azoxystrobin, ether oxystrobin, pyraclostrobin, trifloxystrobin, famoxadone and the like. Antibiotics, including streptomycin sulfate, Jinggangmycin, and Chunremycin. The classes of agents with moderate resistance risk mainly include sterol biosynthesis inhibitors such as triadimefon, diniconazole, tebuconazole, difenoconazole, propiconazole, flusilazole, prochloraz, thirteen. Porphyrin and the like. The class of agents with moderate resistance risks also include procymidone, iprodione, vinyl nucleus, pyrimethanil, cyprodinil, cymoxanil, dimethomorph and the like.
What factors are prone to cause resistance to pests and weeds occurrence and development?
The most important factor in the process of drug resistance production is the choice of agents. The choice of agents is accompanied by the elimination of individuals with poor drug resistance. If a drug is used multiple times in succession, if the application concentration is too high, the application amount is too large, or the duration is too long, it is easy to cause drug resistance. Unsuitable for agricultural dosage forms will also reduce the efficacy of the drug, resulting in the survival of insensitive individuals and the induction of drug resistance. The uneven deposition and distribution of pesticides on vegetables can also cause drug resistance.
Insect factors Different pests have different possibilities for resistance to a drug. In general, pests have a short reproductive cycle, many generations, small individuals, and rapid reproduction, which may lead to resistance accumulation. For example, aphids occur more than ten generations and dozens of generations a year. Many effective agents for killing mites can be used in a local area for about one year.
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