What is the difference between the mode of action of pesticides, fungicides, and herbicides?

1 Mode of action of pesticides.

The most commonly used modes of action of pesticides are contact killing, stomach toxicity, systemic absorption, fumigation, food refusal, avoidance and growth regulation. Contact killing is the most important mode of action of insecticides currently used, which can kill all kinds of pests and mites of mouthparts. Gastric toxicity can generally only control chewing mouthpart pests, such as lepidopteran larvae, Coleopteran adults, and Orthoptera.

nymphs and adults, etc. Aphids.

Iso-sting-sucking mouthparts pests are mostly controlled with systemic agents. Most of the pesticides currently in use usually have more than two modes of action, and the most suitable agent can be selected according to the main control object.

2 Mode of action of fungicides.

The mode of action of fungicides can be divided into protective effect, ** effect and inducing disease resistance. Protective agents are used before plants become diseased to destroy pathogenic bacteria or establish a chemical barrier between pathogenic bacteria and plant bodies to prevent the invasion of pathogens, so that plants can be protected. The killing or inhibition effect of this type of fungicide on pathogenic bacteria is limited to the surface of the plant body, and is ineffective against pathogenic bacteria that have invaded the host.

**The effect is to apply fungicides to the plant body after the plant is susceptible or disease-onset, to relieve the parasitic relationship between the pathogen and the host or prevent the development of the disease, so that the plant can restore health, this kind of fungicide is generally selective and has a long effective period. It can be used before the invasion of pathogenic bacteria to play a chemical protective role, and can also be used after the invasion of pathogenic bacteria, or even after the onset of the disease, to exert its chemical effect. Local ** effect is also known as eradication effect, eradicating pathogenic bacteria that have formed infection at the application site.

Inducing disease resistance is also called immunity, because most of these fungicides do not have a direct poisoning effect on the target organism, therefore, they must be used before the plant is sick, and it is ineffective against pathogenic bacteria that have invaded the host.

3 Mode of action of herbicides.

The mode of action of herbicides is divided into absorption and conduction, herbicides must be absorbed into the weed body to play a role, and if the absorption can not be well conducted, such as sodium pentachlorophenol, it can only act on the weed tissues and their adjacent tissues that come into contact with the agent, thereby affecting the control effect. Conductive herbicides can be transported to underground rhizomes after weed absorption and effectively exert a weedicidal effect.

The most commonly used modes of action of insecticides are contact killing, stomach toxicity, absorption, fumigation, food refusal, avoidance and regulation of growth, etc., the mode of action of fungicides can be divided into protective effect, ** effect and inducing disease resistance, and the mode of action of herbicides is divided into absorption and conduction.

The ingredients are different, the effects are different, the effects are different, the things used in different crops are different, and the methods used are also different.

These are three completely different agents, the ingredients are completely different, and then one is used to kill insects, one is used to kill bacteria, and the other is used to control weeds, and the uses are completely different.

<> pyrethroid insecticides and nicotinic insecticides can be mixed with herbicides (corn herbicides), but it is necessary to avoid corn heart leaves and avoid filling the heart of the drug solution when spraying. The mixed use of pesticides and herbicides should follow the principle of pesticide mixing, that is, there should be no adverse chemical reactions between the mixed drugs, and it should be guaranteed to be able to exert normal efficacy or increase efficiency.

1. What pesticides can be used with herbicides

1. Types of insecticides that can be mixed with herbicides.

1) Taking corn herbicides as an example, pyrethroid insecticides and nicotinic insecticides can be mixed with it, but the heart leaves of corn should be avoided when spraying to prevent the filling of the solution.

2) The alkynyl herbicide can be mixed with most insecticides, and the effect of weeding and insecticide is faster after application, while most of the other herbicides generally cannot be mixed with insecticides, such as zooxazone herbicides can not be mixed with emulsifiable insecticides (or other agents), otherwise pesticide damage may occur.

2. The principle of pesticide mixture.

1) Adverse chemical reactions (such as alkaline hydrolysis, acid hydrolysis, hydrolysis, redox reactions, etc.) should not occur between the mixed drugs, and it should be guaranteed to be able to exert normal efficacy or increase efficiency, and at the same time, it should not affect the physical properties of the drugs, such as emulsification, suspension rate reduction, etc.

2) After different drugs are mixed, they cannot cause pesticide damage to crops.

3) The toxicity of the drug should not be increased after mixing, and it is necessary to ensure the safety of humans and animals.

4) If the mixture can neither increase efficiency nor expand the scope of control, there is no need for mixing.

5) When mixing, it is necessary to pay attention to the antagonistic effect between pesticides to ensure the mixing effect, for example, when mixing with Nayujing and Bendasone, the control effect of gramineous weeds will be reduced due to the antagonistic effect.

2. Which poison is insecticide or herbicide

1. Toxicity of pesticides and herbicides.

Taking low-toxicity insecticides and low-toxicity herbicides as examples, herbicides are generally relatively toxic, such as paraquat, which can be quickly lethal to plants and highly toxic to humans, and there is no specific antidote.

2. How to use herbicides.

1) For annual gramineous weeds, mix 500-700 ml of 10% glyphosate with 30-40 kg of water per mu, and then spray it.

2) For annual broad-leaved weeds, 750-1000 ml of 10% glyphosate mixed with 30-40 kg of water per mu, and then sprayed.

3) Perennial malignant weeds, 1250-1500 ml of 10% glyphosate mixed with water 30-40 kg per mu, and then sprayed.

There are many ways to use pesticides and dust herbicides, depending on the insects and weeds you want to control. For example, some multi-agent agents with fluoride (tethiourea, fluoxalate, and carmopine) can control most weeds and have some insecticide effects. In addition, multi-agent agents with chlorine (cyclothrin, chlorofen and chlorsulfur) can control some foliar insects, and most of them also have some weed control capabilities.

The duration of herbicide use should be strictly controlled. Because the improper use time will make the herbicide coincide with the sensitive period of the crop, which can easily cause harm, such as rice to be weeded before sowing, because the drug will not directly contact the seedlings, can avoid or reduce the harm.

Strictly control the dosage used. The dosage requirements of herbicides are very strict, the dosage is small, and the effect is not good; The use of large doses is easy to cause drug harm. Therefore, during use, it should be carried out in accordance with the instructions or under the guidance of a technician.

Choose the right way to use it, if you don't use it properly, it can sometimes cause harm. If a large amount of liquid spraying is carried out when using soil treatment agents, if the amount of liquid spraying cannot meet the requirements, it is easy to produce drug hazards. If herbicides are not mixed properly with other agents, they are also prone to drug hazards.

Due to the limited resistance of lawns in different periods, the dosage should be controlled strictly according to the instructions for use. If you blindly increase the dosage and spray amount, it is easy to cause drug damage, leading to the normal detoxification and death of the lawn.

We should choose the right way to use it. When spraying with stem and leaf herbicides, the concentration of the ratio is very important. This ratio cannot be calculated simply in terms of dosage per square meter.

It must be added with water in strict accordance with the specified concentration ratio and sprayed evenly so that the leaves are moist and free of flowing liquid.

I don't think herbicides can be used indiscriminately, and the amount of spraying is crucial to ensure that the herbicide kills weeds without damaging the lawn. It is strictly forbidden to spray in large doses, so that the liquid cannot adhere to the surface of the blade and form leaf runoff. Not only is the weeding effect poor, but it is also easy for the liquid medicine to flow into the growth point of the lawn, resulting in the normal detoxification of the lawn.

Temperature directly affects the efficacy of herbicides, generally speaking, when the average temperature of the day is above 10 degrees, the use effect is better, and the weeding performance is slower under low temperature conditions. All herbicides should be applied on sunny, warmer days (summer temperatures over 38 degrees, avoid hot midday) to fully exert their effectiveness.

These technical points are that when sweeping the floor in this way, you must do a good job of protecting yourself, you must wear a mask and eye mask, you must not directly touch the herbicide with your hands, and you must spray the herbicide on the land when spraying it. Because the use of herbicides can remove weeds from the field, so that the growth of crops is not harmed.

To choose the right herbicide for use, we must pay attention to the formula of the herbicide, pay attention to the ratio, need to pay attention to the weather conditions, pay attention to the surrounding environment, must be used reasonably, with herbicides can better remove weeds, to avoid weeds to bring harm to plants.

Introduction: Many farmers in rural areas will have their own fields and plant some crops, but there will be weeds when crops grow, and weeds will rob crops of nutrients for the land, which must be removed, so farmers often spray herbicides on crops in their lives. So what are the ways to use herbicides?

1. Manual spraying - pay attention to the ratio of herbicide medicine and water.

When farmers grow crops, the fields may not be very large, and in many fields where irrigation technology is lacking, farmers generally choose to spray herbicides by hand. After mixing the herbicide and water in proportion, they go to the field and spray it themselves, and there is also a special tool for the sprayed drugs. Different crops have different endurance to herbicides, and the ratio of herbicide and water must be appropriate before spraying, so that crops can not be killed because the pesticide concentration is too high.

After making all preparations, you should also pay more attention to the temperature of the herbicide, because the effect of herbicide weeding is also related to the temperature. The higher the temperature, the more effective the pesticide will be against weeds, and the more effective it will be to control weeds. Therefore, when spraying pesticides, pay attention to the temperature used, so that you can maximize the effect of the drug and prevent your efforts from being in vain.

And when spraying pesticides, you should also pay attention to the weather conditions, it is not possible to spray drugs on rainy days, because it is easy to get pesticides yourself, and the temperature is low on rainy days, which will reduce the effect of pesticides; So in order to get the most out of your herbicide, choose the right weather and temperature. <>

In many large farmlands, there will also be high-tech products specially used to spray pesticides, and even spraying, which can not only protect workers from pesticides, but also reduce a lot of manual labor, which will be very convenient, although the cost is a bit high, but for some large and important crops, you can replace labor in these ways.

It can be used in a blended version of pesticides, or directly with pesticides, or with water, with insecticides, and with anthelmintics, which are all relatively common ways to use.

It is necessary to choose the appropriate concentration for use, to be targeted, not to abuse herbicides, but also to pay attention to the way of spraying, and pay attention to the location of spraying.