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Question pesticides do not work?
In recent years, vegetable gardens, in particular because of their high selling prices and good returns, have paid no attention to the cost of production, and they are willing to use medicines. In addition, the use of pesticides has increased the use of pesticides per mu.
The problem also followed, and pests became more and more difficult to cure. Cruciferous moth and flea beetle on cruciferous vegetables, the original control effect of some pesticide products can reach 80 percent, but now it can only reach 230 percent; the cabbage caterpillars on the onions and other crops And Spodoptera exigua, in previous years with A-dimensional salt can be a good prevention and treatment, this year when the outbreak of what pesticides are not very useful.
At the same time, pesticides are constantly being replaced. However, the new product has been “lost†for a while, and the product update obviously cannot keep pace with the development of pest resistance.
Weapons can not rely on medication alone
There are many reasons why pests are resistant to pesticides. They cannot rely solely on medication, and must be comprehensively controlled.
Do a good job of pest monitoring. According to the development status of the pest population in the field, it is decided whether or not to prevent and control, what time to prevent and control, and what methods to use for prevention and control. After the prevention and control, it will be monitored again based on the results of prevention and control, and whether or not to prevent and control again will be decided.
Adopt comprehensive measures. Combining physical control, cultivation management, crop rotation, natural enemies, and pesticide control, the principle of the combination of chemical pesticides, plant-derived pesticides, biological pesticides, and sex attractants and chemical repellents can be adopted even when using drug control.
It can be simple and not complicated. For a single pest, when using pesticides with a narrow spectrum of control or with high specificity, it is advisable to avoid the use of broad-spectrum pesticides or multiple pesticides. For example, when imidacloprid is used to control aphids to control their damage, if they are combined with pyrethroid pesticides and organophosphorus pesticides, even increasing the dose of a single dose will not only cause waste, but will inevitably lead to the development of pest resistance. Once sexuality occurs, general agents are difficult to control.
The correct choice of medication time. For example, insecticides and acaricides should be selected such that the insects are most sensitive to the agents at the most sensitive stage. Different agents are sensitive to different stages of insect pests. If they are sensitive to larvae and have an ovicidal effect, they can be used in the early stages of insect pests, and some are larvae. Or nymphs killing strong, can be used before and during the pest occurrence period, and for the older pests should be used fast knockdown and strong absorption of the permeability of pesticides to control.
Rotate and mix pesticides. Avoid repeated use of the same type and type of pesticides to help delay pest resistance.
Try new drugs. Some pesticides have been disabled for many years due to their resistance. When pests are resistant to other pesticides, they may not be able to try these pesticides and may have unexpected results.
Protect natural enemies. For example, Trichogramma species is the natural enemies of most species of the larvae. When pests are controlled, pesticides with low toxicity to the bees should be selected as far as possible to help protect Trichogramma.
Use new technologies. Such as the use of insecticidal lamps, insect nets, sex pheromone, natural enemies, etc. to prevent and control pests; use spray film-formers to protect the scraped lesions or cut-out cuts to prevent germs from infesting; orchards with grasses or grass Instead of drugs to control weeds. (é‚Ke City)
Which vegetable pests are resistant?
At present, the most resistant species in the vegetable pests are Plutella xylostella, Spodoptera exigua, and Helicoverpa armigera. Other resistant insect pests include Peach, Pheasix, Leafhopper, Red spider, Yellow striped hop, Hippophae , pod pods, Spodoptera litura, tea yellow pods and so on.
Which agents are susceptible to resistance?
The most susceptible to insecticides are pyrethroid insecticides. The name of the herbicide is often a certain chrysanthemum; carbamate insecticides, the name of the pesticide often bears a “Wei†character; insect growth regulators and organic Phosphorus pesticides, the name of the drug often carry a "phosphor" 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 classes that are most susceptible to resistance include benzimidazoles, including carbendazim, thiophanate-methyl, thiabendazole, and benomyl. Phenyl amides, including metalaxyl and caustic sod. The methoxy acrylates include azoxystrobin, kresoxim-methyl, pyrazotosin, trifloxystrobin, fluconidone, and the like. Antibiotics include streptomycin sulfate, Jinggangmycin, and kasugamycin. The categories of agents with moderate risk of resistance mainly include sterol biosynthesis inhibitors such as triadimefon, diniconazole, tebuconazole, difenoconazole, propiconazole, flusilazole, prochloraz, thirteen Porphyrin and so on. Agents of moderate risk of resistance also include procymidone, iprodione, vimentin, pyrimethanil, cyprodinil, cymoxanil, dimethomorph, and the like.
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