Many vegetable farmers are using fumigation to control pests and diseases in their sheds, what are t

Can repel pests. And it will not affect the quality of vegetables, this practice is also very effective, and it can also protect vegetables from insect bites to the greatest extent.

Greenhouse smoke agent is a kind of pesticide that burns the agent into smoke and has a bactericidal and insecticidal effect. Because the smoke agent is easy to be affected by the air flow and is easy to drift, and at the same time, it will cause great pollution to the environment, so the smoke agent is usually only suitable for use in greenhouses, which can play a greater role in prevention and control. The smoke dispersed after ignition is a fine solid particle, and the deposition of the smoke agent on the surface of the crop mainly depends on the adhesion or electrostatic adsorption, but its adhesion is very small, and the adhesion ability of the powder particles is improved on the surface of the crop with water film, which can improve the control effect.

It is used for the prevention and control of diseases and insect pests in the closed environment of greenhouses and greenhouses, and can make full use of the movement ability and floating of fine powder particles in the air, so that the front and back of plant leaves can be evenly deposited with drugs, improve the control effect, and will not pollute the environment outside the shed.

The fumigation method does not use water, does not increase the relative humidity of the air in the protected area, and is not limited by weather conditions, and can be used on cloudy, rainy and snowy days.

The smoke agent is composed of the original drug, the accelerant, the oxidant, etc., and the smoke is generated after ignition, and the particles are formed in the air to form aerosols, which are diffused in the protected area, and finally evenly deposited in all parts and organs of the plant.

No need for any machinery, as long as the smoke agent is placed, ignited, after the smoke is burned, it generally only takes 3 5 minutes, the smoke will be diffused in the greenhouse, the pesticide dispersion is high, the particles are small, it can float for a long time and settle slowly, including the wall, the roof, the soil surface and the front and back of the plant leaves can be sprayed, and can even penetrate into the soil void, and the drug effect is high.

This can avoid some pests and diseases, and can also reduce the damage of some insects to crops, the most important thing is that this method is very effective, and the smoke will not spread casually.

Greenhouse smoke is very effective in the prevention and control of greenhouse vegetable pests and diseases in winter, and can also effectively adjust the climatic conditions in the greenhouse to ensure the normal and healthy growth of greenhouse vegetables. However, there are many problems to pay attention to in the smoke, otherwise good results will not be achieved. So what is the correct way to operate greenhouse fumigation?

Let's take a look. <>

First, the smoking method is generally carried out at night, and the operator can close the greenhouse overnight after igniting the smoke agent to ensure that the fine smoke particles can be deposited and evenly distributed in the shed. Ensure the quality of cigarette agents and do not use counterfeit and shoddy products.

Second, the dosage should be reasonable. Choose the appropriate dose according to the shed area and instructions for use, and do not increase the dose at will to prevent the occurrence of pesticide damage.

Third, choose the time to smoke. Because the temperature affects the uniform distribution of smoke particles, i.e. the smoke particles are easily repelled by hot objects and transferred to cold objects. Therefore, the time of smoking is in the evening or early morning when the temperature of the plant leaves is lower, so that the smoke particles can better gather on the leaves.

On a sunny day, try not to smoke at noon when the temperature is high. <>

Fourth, make sure the greenhouse is well sealed. Because the smoke agent is easy to flow, if the sealing of the shed is not good, because the temperature inside the shed is higher than the outside, the smoke particles will drift out of the greenhouse with the air flow, reducing the efficacy of the drug. Therefore, when smoking in the greenhouse, it is necessary to ensure that the seal of the shed is intact.

5. Don't let the sealing time take too long. Because harmful gases are produced during the smoking process in the greenhouse, if these gases exceed the tolerance limit of the plant, it will cause pesticide damage. So, when smoking, don't let the shed close for too long. Generally, ventilation should be done after 8-12 hours.

Sixth, it is necessary to pay attention to the safe use interval of the tobacco agent, and do not harvest and market during the safety interval to ensure the quality and safety of greenhouse vegetables. <>

The basic steps and methods of smoking in a greenhouse are as mentioned above. As long as the correct practices are followed, there are generally no safety accidents and drug hazards. Farmers who don't know how to operate let professional agricultural technicians guide the operation.

Do not allow the seal to take too long. This is because harmful gases are produced during smoking in greenhouses, and if these gases exceed the tolerance limit of the plant, they can cause plant toxicity. Therefore, when smoking, do not leave the shed closed for too long. Generally, ventilation should be done after 8-12 hours.

Leave a vent above the smoke to keep ventilation when using it to avoid indoor carbon monoxide accumulation and harm to the body.

Close the vent to make the greenhouse in a closed state, and then place the smoke agent on the walkway in the shed, close the shed outlet after igniting the smoke agent, and the smoke method is generally in the evening, and the shed can be closed after lighting the smoke agent.

Keep the vents, if you don't keep the vents, the air doesn't circulate, you can't do well.

What do vegetable farmers need to pay attention to when operating greenhouse fumigation?

Nowadays, many vegetable farmers will grow vegetables in the greenhouse, and will carry out greenhouse fumigation to prevent and control greenhouse pests and diseases.

The first point is to buy smoke from regular sources. The fuming agent should be fired at night or early in the morning when the temperature of the plant leaves is low, which favors the accumulation of smoke particles in the leaves. It works best at night.

Avoid production losses caused by the use of counterfeit and substandard products. Choose the appropriate dosage and do not add the dosage arbitrarily to avoid damage from the drug. Because smoke particles have heat-induced migration, i.e., smoke particles can be repelled by hot objects and deposited into cold objects.

The second point is that it is a better way to use flue gas disinfection and pesticides to disinfect the flue gas in the greenhouse. Smoke fumigants have a good effect on the control of greenhouse pests and diseases in winter, but they have received extensive attention. If it is used or operated improperly, it is easy to cause drug damage to crops, administration before and after medication, etc.

Its advantages and benefits are mainly reflected in the wide range of control, the use effect is remarkable, the cost of drugs is low, and the drug residues are small.

The third point is to strictly control the time of medication. During vegetable growth or in empty sheds after harvesting, smoke can be used to control vegetable pests and diseases. The best time for smoking sheds is in the evening or on cloudy days, which is conducive to the sinking of smoke particles and has good control effect.

After fumigation of the shed in the evening, adequate ventilation is carried out the next morning, after which the agricultural operation begins. If it rains and ventilation is poor, do not smoke in the shed the night before to avoid damage to vegetable drugs.

The fourth point is the release method. The dosage should be used according to the control object, in line with the principle of economy and high efficiency, the appropriate agent and the appropriate dosage should be evenly placed on the ground and lit with incense or cigarette butts. Whole bags of vegetables can be used in large vegetable sheds in the city.

The small vegetable shed can put the smoke agent powder into a small paper tube rolled up with old newspaper, insert the ignition tray and ignite the ignition from shed to shed.

For example. The area of the shed is one acre, and the scaffolding is four meters high. About 500 grams of chlorothalonil tobacco can be used, such as.

Above four meters. or less than four meters. The amount of aerosol used can be increased or decreased at any time.

The initial occurrence of pests and diseases or the first time before the occurrence of pests and diseases can basically have a good effect. In the middle and late stages, you need to use it once every 7-10 days, and it is better to use it 2-3 times in a row! Bactericidal smoke agents are commonly used in chlorothalonil fog agent, downy mildew carb smoke agent, insecticidal mite isoprocarb smoke agent, fumigated aphid net, etc., in terms of the prevention and control of whitefly, the effect of smoke agent is much better than spraying.

For example. The area of the shed is one acre, and the scaffolding is four meters high. About 500 grams of chlorothalonil tobacco can be used, such as.

Above four meters. or less than four meters. The amount of aerosol used can be increased or decreased at any time.

can be smoked. Try to choose sunny evenings, the purpose is not to ventilate, and the shed is tight. Do not take too long to prevent drug damage.

Also pay attention to the dosage. Insecticides can kill aphids, thrips, whiteflies, etc., fungicides can kill gray mold, etc.

<> determine the reasonable number of drug use 1. When using smoke agents to prevent and control diseases, it is best to use them in the early stage of the disease. 2. Smoke once every 6-7 days, 2-3 times in a row. Quickly close the doors and windows of the shed, and fully ventilate the next morning before agricultural operations can be carried out.

After applying pesticides during the day on rainy days, it can be quickly sealed for 4-6 hours before it can be released to avoid personnel poisoning. That is, in continuous rainy weather, the humidity in the shed is too large to spray, and the smoke can be used to smoke the shed as an emergency pest control program, which will not increase the humidity in the shed, but also prevent diseases.

The next morning it must be ventilated; In our experience, insecticide and bactericidal smoke should not be smoked together, and can be smoked again every day or two. Smoke is generally effective against insect pests, such as thrips, aphids, and green worms! It is still necessary to combine the main spray with moisture spray!

It can be used in greenhouses with high humidity, but the disadvantage is that it reduces the service life of the greenhouse film. Note that after using the fumigant, it must be ventilated before personnel can enter the greenhouse for agricultural operations. In rainy days, after applying pesticides during the day, it needs to be sealed for 4 to 6 hours before the operation can be released;

It is recommended to use it in the evening, or use it in the evening on a cloudy day, the surface temperature of vegetables during the day is similar to the surface temperature of the particles, which is not conducive to the precipitation of pesticide particles!

Before taking the drug, determine the drug variety and dosage according to the instructions.

The application method is confirmed! According to the content of the active ingredient of the cigarette agent, the size of the greenhouse space is determined, and the active ingredient of the general tobacco agent is between 10%-30%, and 3-5 points should be placed per mu; If the shed is relatively short, a cigarette agent with low active ingredient content should be selected, and 7-10 should be set up per mu to ensure the safety of medication. Evenly spread in the gutter or walkway!

When using fumigants, pay special attention to the following three items. Pay attention to the frequency of use, not too often, and use fumigants reasonably. Pay attention to the right medicine, and use different fumigants for different pests and diseases. Master the use of fumigants.

1.Application time. According to the characteristics of greenhouse vegetable production, it is best to apply the fumigant after sunset in the evening, so that the agent can be smoked at night, which is more conducive to the sinking of the fog particles of the smoker, and the control effect is more ideal.

2.Cast Method. Select a few smoke points, place the smoke evenly on the ground, and light it with an incense or cigarette butt.

Most of the tobacco agents sold on the market are 100 gram sachets, and the large vegetable sheds can be used in whole bags, and the small vegetable sheds can put the tobacco powder in a small paper tube rolled into old newspapers, and insert the ignition twist to ignite; It can also be used to fill 100 grams of tobacco powder into the tobacco column, and each one can be cut into two sections. The ignition sequence is from the inside of the shed to the entrance of the shed.

3.Dosage applied. In the use of the principle of cost-effective, according to the prevention and control object to choose the appropriate agent and appropriate dosage.

For example, for the prevention and control of cucumber downy mildew and blight, tomato early blight, late blight, gray mold, sclerotinia sclerotiorum, etc., 10% Pythium tobacco agent can be selected, 250-300 grams per mu, and the severely diseased fields should be appropriately increased to 400-500 grams; For example, for the prevention and control of powdery mildew, 15% gram of chlorpyride can be used, and 250-300 grams per mu can be used; It can also be smoked with 250 grams of sulfur powder and 500 grams of sawdust per mu.

4.Precautions. The smoke agent in the shed should be sealed for at least 4 hours, preferably around sunset, and the vents can be fully opened for ventilation the next day. The use of chlorothalonil aerosols should only be carried out in greenhouses or greenhouses, and must be closed tightly.

In the winter of the house, high humidity is a very important issue. Especially on cloudy days, rain and snow, and the humidity is higher when the ventilation is not good. The high humidity environment is very favorable to the occurrence and spread of pests and diseases, and once pests and diseases occur, the yield and quality of vegetables are greatly lost.

For pests and diseases caused by high humidity, in addition to agricultural precautions such as reducing greenhouse humidity, we most commonly use tobacco prevention with tobacco agents. Improper use by some novice growers often leads to weakness. Today, let's take a look at what problems need to be paid attention to when eating and smoking vegetables in plastic greenhouses, I hope it can help.

Stay on top of how long your medications are used.

Vegetables can be fumigated after they are grown or harvested. It is best to do it at night or on a cloudy day. The prevention effect is relatively good.

The next morning, after timely ventilation, normal tillage work was carried out. The effect of the smoked warehouse on cloudy days is good, but it is also necessary to pay attention to the details. Check the weather forecast in advance, and if it rains the next day, don't do a smoke screen that night.

Otherwise, it is easy to cause weakness. If it rains, snows, weather, or smokes in the warehouse, you can do it during the day. Pay attention to the closed room for 4 to 6 hours, up to 8 to 12 hours, rain and snow stop ventilation after management.

Pay attention to the main points and usage.

Needless to say, in the case of different types of pests and diseases, choose different tobacco agents and pay attention to the reasonable amount of use to avoid other problems.

45% chlorothalonil, 200-250 grams per acre, 10%, 250-300 grams per acre;

10% Sucrine, 200-300 grams per acre at the beginning of the disease;

22% dichlorobos, 300-400 grams per acre, 10%, 400-500 grams per acre.

Control the number of times you use your medications.

Sick. The disease can only be controlled once in the early stage of the disease, and the warm film can be controlled every 7 to 10 days in the middle and late stages, and it can be controlled continuously for 2 3 times. However, if the disease is severe or the plastic greenhouse is not well sealed, the dosage can be increased or the interval can be reduced.

Zhonghai. The initial use is carried out every 5 7 days, and depending on the seriousness, another 2 3 disciplinary actions are imposed. Interestingly, insecticides only kill insects, not eggs, eggs and larvae hidden in the soil and leaves, and must be injected with sprays to kill them.

Master the use of medications.

According to the area and space of the house to determine the amount of use, divided into multiple places, generally set 3 5 burning points per mu. At the same time, place the aerosol agent 20 50 cm above the ground so that the smoke spreads and spreads evenly, so that it burns evenly everywhere.

When lit, light it from the inside out, with a cigarette in turn, and finally light the front of the door. After all are ignited, leave the plastic greenhouse and close the sealed cabin so as not to affect the effect.