How can I avoid the emergence of pest resistance in crops? What is the correct application of pestic

<> "What is the effect of stomach poisoning, contact killing, systemic and fumigation of insecticides?" Insecticides can enter the body of pests through certain ways, and there are four main ways to act on pests: stomach poisoning, contact killing, systemic and fumigation.

Gastric poisoning refers to the way in which pesticides are sprayed on crops or mixed in seeds or bait. When the pest eats it, the insecticide enters the digestive tract with the food, is absorbed and spreads to various tissues such as nerves and muscles through the hemolymph, producing a toxic effect.

The touch effect refers to the mode of action in which an insecticide is sprayed on the surface or habitat of an insect or plant. After the pest comes into contact with the insecticide, the insecticide enters the insect body through the pest's epidermis or sensory organs, or even spirochetes, and spreads to targets such as nerves, muscles, or glands through the hemolymphatic circulation, causing pest poisoning and death. Indoxacarb has the effect of contact killing and stomach poisoning, and is effective against larvae of all instars.

The drug enters the insect through contact and feeding. Within 0-4 hours, the insect stops eating and immediately becomes paralyzed. The coordination of insects decreases, and insects die within 24-60 hours after the administration of the drug.

In general, it is very low toxic to mammals and domestic animals and is very safe for beneficial insects such as non-target organisms in the environment. It has low residues in crops and can be used for total pest control and resistance management. The prevention and control of red bollworm and cotton bollworm is used to the flower buds, green bells and group tips; In order to prevent borers from causing dead core seedlings, poisonous soil can be sprinkled; To prevent and control smut, spray or water.

Rice planthoppers and rice leafhoppers spray the liquid medicine to the base of rice plants; To control moths, spray the liquid medicine on flower buds and young pods. In addition, for hidden pests such as cotton aphid, red spider, rice planthopper, rice leafhopper, etc., according to their stinging and sucking mouthparts feeding mode, strong systemic insecticides can be sprayed to other parts of the plant to achieve the purpose of administration in place. Only by applying pesticides and delivering pesticides in place can we hit the key points and achieve the effect of medicine to insect removal, so that the medicine can play the best role and obtain the ideal insecticidal effect.

If we want to avoid the emergence of resistance, first of all, we should pay attention to dilution in the process of use, and also pay attention to the appropriate amount of tea spraying regularly, etc., the correct way to use pesticides is to dilute them with tap water, and then spray them after dilution.

In order to avoid this situation, we should pay attention to the appropriate amount in the process of making tea, and we must also spray the correct use of insecticides regularly, that is, add some tap chickenpox to dilute it and spray it, and it should also be done regularly.

We can spray some pesticides in the morning or evening, and we can mix them to play a certain resistance; We can take a watering can and spray his leaves.

Therefore, when we buy pesticides, we also need to buy different insecticides, and every time we spray, the dosage is also different, and we must match it before spraying, so as to avoid it.

It should be watered and fertilized in a timely manner, and the management of water and fertilizer should be strengthened, and the field management should be strengthened, and some pesticides should be sprayed regularly.

First of all, it is necessary to choose the appropriate medicine according to different pests, and then it is also necessary to change it in turns, and you can also choose to mix and maintain, or you can also use the drug indirectly when using the drug, and then you can also choose a scientific way to spray pesticides.

Hello, it is a pleasure to serve you, here for you to inquire about the role of pesticides in general resistance to pests? 1.Pesticide resistance refers to the resistance of the target diseases, insects, and weeds to pesticides.

2.As preventive measures, pesticides play an important role in the prevention and control of diseases, insects and weeds, the growth of plants, and the health of the people. Pesticide resistance refers to the resistance of the target diseases, insects, and weeds to pesticides.

Antimicrobial resistance can be divided into two types: natural resistance and acquired resistance. Natural drug resistance, also known as drug resistance, is due to different biological species, or different growth stages and different physiological states of the same kind to produce different tolerances to drugs. The acquisition of resistance is due to the long-term, continuous use of one pesticide in the same area, or the use of pesticides with the same mechanism of action, so that the resistance of pests, pathogens or weeds to pesticides increases.

As preventive measures, pesticides play an important role in the prevention and control of diseases, insects and weeds, the growth of plants, and the protection of people's health. However, chemical control measures are a kind of emergency measures, which are to use pesticides quickly and efficiently to control the hazards when the objects to be controlled reach a certain number and will cause considerable harm to crops, and when other measures are difficult to work for a while. In order to prevent and control diseases, insects and weeds, the use of pesticides is necessary, but it must be used in a controlled and scientific manner.

You can't use pesticides as soon as you see a little disease, insect and weed, and the number of pesticides used too much will greatly enhance the chance of pesticide selection for the target of the control and accelerate the emergence of resistance. Many scientists believe that pests' adaptation to pesticides can also lead to pesticide resistance, which in turn affects the inputs used and crop yields. Pests have legs and wings to fly and jump, the activities of one farmer can affect neighbors, the activities of one area can affect other areas, and houseflies flying from factory areas can be resistant to many pesticides.

Scientists note that in 1980 there were 428 species of arthropods that were resistant to one or more pesticides or acaricides, and more than 60 percent of them were essential for agricultural activities. Among the plant pathogens in crops, 150 are known to be resistant to pesticides. An estimated 50 species of weeds are resistant to herbicides.

New pesticides are being developed to target a wider range of pests, and genetic engineering is also being developed. Genetic factors (e.g., recessive resistance genes), ecological factors (e.g., pests sensitive to pesticides quickly leave the area where pesticides are applied) and operational factors (scientific and rational use of pesticides) can reduce pest resistance to some extent.

In the process of planting crops, there will always be some unsatisfactory things, such as repeated diseases or some insect information, at this time we definitely need to use some pesticides, but after the use of pesticides for a long time, there will definitely be some resistance, for the emergence of resistance, we must find some ways to avoid drug resistance or drug resistance, we must find other ways, other drugs to target. <>

Rotational medication has to be said to be a good way to use pesticides and avoid developing resistance. For example, if you have developed resistance to this contact type of pesticide, then I can use an endogenous type to avoid resistance. Because there are many types of pesticides, the simplest classification of pesticides is that there is a contact type and an endogenous type, and the characteristics of their pesticides are different, so it is not easy to develop resistance.

Even if the insects are resistant to the systemic type, then we can replace the pesticide and use the contact type, which can have a good killing effect. <>

Although some of today's pesticides are relatively simple, we can avoid the development of resistance through subsequent mixing and processing. As a simple example, we use this slow insecticide and an acute insecticide to make a pesticide that inhibits the growth of insects, so that it can be very good to avoid the development of resistance. Mixed pesticides such as trichlorfon and dichlorvos or malathion are often used, and when this pesticide is mixed together, it tends to be more effective at killing insects.

For pests that have developed resistance, we can add some synergists, which can activate pesticides, enhance the effect of pesticides, and avoid insects from becoming resistant. Nowadays, pesticides will more or less have some synergist additives, these additives and synergists are to make the effect more significant, so they will have a better effect on insecticides.

According to the personal information, do not use a single pesticide to control a certain pest for a long time, so as to cut off the formation process of pest-resistant populations. Pesticides with different mechanisms of action should be selected as far as possible for the varieties used in rotation. The principle of insecticide is different and can be used interchangeably.

The rotation of the same type of pesticide varieties should be cautious, because pests are easy to obtain cross-resistance, that is, after resisting a certain pesticide, it will also be resistant to other varieties of the same kind of pesticide.

Do not use a single pesticide to control a pest for a long time, so that the formation of pest-resistant populations can be cut off. Pesticides with different mechanisms of action should be selected as far as possible for the varieties used in rotation.

Different pesticides can be used to avoid pests becoming resistant to pesticides, as not reusing pesticides prevents pests from developing resistance to a single pesticide.

After long-term application of pesticides, the pests that survive after each application are resistant or resistant groups, and these groups continue to multiply, expand the population, and the pesticide control effect is not good. This is what is commonly referred to as pests that develop resistance.

According to Darwin's theory of natural selection, after long-term use of pesticides, drug-resistant pests are selected again and again by drugs, and continue to reproduce and inherit naturally, so that after the long-term selection of drugs, the number of drug-resistant individuals in the pest population continues to increase, which is commonly known as the enhancement of pest resistance.

There are many ways to prevent insects, the key is what your object is, if it is a seed, you can dry it and put it in a dry utensil to seal ---

1. Choose insect-resistant varieties.

2. Clean the farm, destroy the habitat of pests, or use insect nets to isolate 3. Physical pesticide: such as yellow board trapping and black light trapping.

4. Biological control: such as natural enemy control, pest and parasitic bacteria control.

Pest control is divided into physical control, chemical control, and biological control. If pesticides are not used, physical and biological control remain.

1. Choose insect-resistant varieties for seeds or seedlings.

2. Do a good job in field water and fertilizer management (the use of liquid film has a certain insect control effect, and some biological fertilizers have a certain insect control effect).

3. Physical control of pests in the field, such as catching them by yourself, such as using insect trap lamps, yellow boards and other appliances.

4 Biological control of pests in the field is to use natural enemies of pests to control, such as frogs, birds, and what bees are planted, and so on.

The first is to take physical defenses, such as insect nets, sticky insect boards, booby trap lights, etc. Now many bases are already in use.

Second, biological control methods, such as stocking red-eyed bees, using predator mites to control leaf mites, Beauveria bassiana and Metarhizium aeruginosa have been widely used.

Third. Using sex attractants, this technology has been successfully promoted in Guangdong and Sichuan.

Fourth, for some pests, manual killing methods can also be used to effectively control them.

That's all I can think of, and I personally think that physical methods are most effective without pesticides.

1. Use an insect net.

2. Use yellow, blue and purple plates.

Yellow plate: aphids, whiteflies, spotted divers, jujube spiders, bugs, golden-striped moths, mushroom mosquitoes, fruit flies, paramecium, pear stem bees, pear yellow mealy aphids, mosquitoes, etc.

Blue plate: thrips, rice planthoppers, dimorphic borers, cotton bollworms, tea armyworms.

Purple plate: cabbage insects have a strong trapping effect.

3. Use sexual attractants.

4. Use poplar or willow to trap and kill adults with sweet and sour solution.

The main factors that cause pests to develop resistance to pesticides are ().

a.Climatic conditions are poor.

b.Environmental conditions.

c.Whether pesticides are used scientifically.

d.The pest's own resistance can weaken its strength.

Correct Answer: Are pesticides used scientifically or not.

When using pesticides to kill insects, you should pay attention to personal safety. What should I pay attention to when using pesticides to kill insects? The timing of administration should be determined according to the temperature and its changing tendency.

Whether it is a plant, insect or bacteria, the specific dose time is 20-30; It's not clear. However, it should be noted that the exhaust port should be opened for ventilation during administration, and the drug should not be injected at noon. Take the medication in the morning or afternoon to make it better.

is the most suitable operating temperature. pesticides and caresses; Gastric poison is in contact with killing, and it is evaded; TEM-tetraacetaldehyde has a strong attraction.

Spring, autumn and rainy seasons; after sowing or transplanting; Low temperature (below'8451；) or high temperature (above 35° Josep 8451;Because snail growers have many misunderstandings when using pesticides, it not only leads to poor sterilization and insecticidal effects, but also affects the growth of vegetables. activities, they predominate during the appropriate period of medication. It is usually controlled at the incubation period or the first transient larval stage of the peuticle topo.

When spraying pesticides to treat insects, there are many misunderstandings worth being wary of, which not only do not help prevent insects and cure diseases. What problems do farmers need to pay attention to in the process of spraying pesticides and insects, and the insecticide should be killed and killed The appropriate application period that each insecticide insists on should be the larval stage before the stage of plague; Borehole pests should be used during the peak period of egg hatching, including the following: pay attention to casting, and avoid scrubbing static electricity when using.

Pesticides are flammable and **. Sparks from friction or static electricity can also cause**.

It is best to stay away from or turn off the energy** to avoid vigorous agitation. Note that pesticides, carbamates, and other pesticide components containing organophosphates must ensure the quality of the pesticide and meet the temperature conditions for the rapid growth of BT bacteria. Avoid strong sun exposure as UV rays can cause damage to BT bacteria.

Use of medication after 4 p.m. In addition, care should also be taken not to smoke when spraying spray insecticides to avoid igniting the surrounding spray and burning the spray.