What should I pay attention to when using fumigants to grow vegetables in a greenhouse?

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.

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.

The use of drug fumigation method to prevent diseases in greenhouses has the advantages of time-saving, high efficiency and no increase in indoor temperature. After entering the winter, the greenhouse should be closed at night to keep warm, which gives the standard for the closed smoke of the shed, and many farmers are using smoke to prevent diseases in the shed. However, some farmers have made mistakes in the operation methods of greenhouse fumigation, resulting in fertilizer damage or weak medicinal power.

For such a situation, here is an introduction to the operation steps and common problems of greenhouse fumigation, to help farmers grasp the greenhouse fumigation technology.

Procedure

Before the application of the smoke agent, all the ventilation holes of the greenhouse must be turned off, so that the shed is in a closed situation, the smoke agent is placed on the aisle in the shed, and the entrance and exit of the shed are closed after the smoke agent is ignited.

Frequently Asked Questions

Purchase cigarette agent from regular platforms to prevent the application of counterfeit and substandard products from causing production hazards; According to the total area of the shed and the instruction manual, select the appropriate amount of medicine, do not add the amount of material at will, in order to prevent fertilizer damage. This is because smoke particles have thermally induced transfer, i.e. smoke particles can be pushed against hot objects and accumulate on cold objects. Therefore, the smoke agent should be set off at night or in the morning when the temperature of the main stem and leaves is low, which is conducive to the accumulation of tobacco particles in the leaves, and it is convenient to use at dusk, and the actual effect is best to prevent the smoke agent from being fired when the sun is shining in the afternoon on a sunny day.

The smoke agent is easy to fluidize, and once a hole occurs in the shed, because the temperature inside the shed is higher than that outside, the smoke particles will be free and easy to escape with the cyclone, endangering the medicinal power. Therefore, before setting off the smoke agent, you should carefully check whether the shed is tight, and close the windows and doors of the shed after setting off the smoke agent. In the whole process of using the smoke method in the greenhouse, because the smoke will cause harmful substances such as CO, HCL, SO2, NO, etc., when it exceeds the tolerance level of green plants, it will cause fertilizer safety accidents.

Therefore, after the selection of fumigation method, the greenhouse cannot be closed for a long time, and ventilation should be carried out after 8 to 12 hours to discharge harmful substances. Pay attention to the safety observation period for the application of tobacco agents, and it is not allowed to be picked and sold during the safety observation period.

l.Purchase tobacco agents from formal channels to avoid production losses caused by the use of counterfeit and substandard products. 2.

Choose the appropriate dosage according to the area of the shed and the instructions for use, and do not add anything at will, so as not to cause drug damage. 3.Due to the thermoinduced migration of smoke particles, that is, the phenomenon that smoke particles can be repelled by hot objects and deposited on cold objects.

Therefore, the smoke agent should be fired in the evening or early morning when the leaf temperature of the plant is low, so that the tobacco particles can gather in the leaves, and it is easy to use and the best effect in the evening, so as to avoid the smoke agent in the direct sunlight at noon on a sunny day. 4.The smoke agent is easy to flow, once there is a hole in the shed, because the temperature in the shed is higher than the outside, the smoke particles will drift to the outside of the shed with the air flow, affecting the efficacy of the drug.

Therefore, it is necessary to carefully check whether the shed is tight before discharging the smoke agent, and close the doors and windows of the shed after the smoke agent is discharged. 5.In the process of adopting the smoke method in the greenhouse, harmful gases such as CO, HC1, SO2 and NO will be produced due to the smoke of the smoker, which will lead to pesticide accidents when the plant tolerance limit is exceeded.

Therefore, the greenhouse cannot be closed for a long time after the fumigation method, and the ventilation should be carried out after 8 l2 hours to discharge harmful gases. 6.Pay attention to the safe interval between the use of tobacco agents, which cannot be harvested and marketed.

When using fumigants, correctly calculate the amount of greenhouse fumigants used according to the size of your own shed. If there is a large difference in the volume of the facility space with the same planting area and different heights, the space volume should be accurately calculated and the dosage should be determined according to the size of the vegetable plant.

Be sure to buy the medicine through formal channels, use it in a closed environment, grasp the indoor temperature, choose the right time, and grasp the frequency of smoking.

When operating the greenhouse fumigation, it is necessary to pay attention to the temperature control, the smoke point is best in the center, and then do ventilation, so that the smoke disperses faster.

You need to take care to protect yourself, you need to leave immediately after the smoke, you need to pay attention to your health, and you need to pay attention to the time you spend in the greenhouse.

What are the common problems in the application of smoke drugs when growing vegetables and fruits in greenhouses? When planting vegetables and fruits in greenhouses, the application of smoke drugs has a clear and effective frequency of taking drugs, a correct understanding of the prevention goal, a symptomatic **, strict control of the dosage, moderate fumigation, mastery of the way of taking medicine, and a symmetrical point. What are the common problems in the application of smoke drugs when growing vegetables and fruits in greenhouses?

1. Clarify the effective frequency of medication.

1. In the case of the application of smoke drugs to prevent problems, it is best to apply them in the early stage of disease, which can prevent pests and diseases faster.

2. In the early stage of illness, setting off fireworks and a smoke drug can achieve a good prevention effect.

3. In the second half of the disease, a cigarette drug should be used every 7-10 years, and it should be used two or three times.

4. For serious diseases or poor sealing characteristics of greenhouses, the dosage can be moderately increased or the time interval of medication can be reduced. What are the common problems in the application of smoke drugs when growing vegetables and fruits in greenhouses?

2. Correctly understand the goal of prevention and treat the symptoms.

1. In the application of smoke drug prevention, it is necessary to treat the symptoms and take drugs for different pests and diseases.

2. The common fumigants are: 10% mancozeb fume, 10% pythium fume, and 10% insecticidal double fumigant.

3. For greenhouses with a variety of diseases, compound smoke agents can be used to carry out prevention, such as: a. When preventing greenhouse tomatoes and loofah leaf mildew, use Pythium fog agent; b. To prevent cucumber downy mildew, disease, tomato early blight and late blight in greenhouses, mancozeb aerosol agent is used. What are the common problems in the application of smoke drugs when growing vegetables and fruits in greenhouses?

3. Strictly grasp the dosage and smoke moderately.

1. When taking medicine, the effective dose should be determined according to the size of the indoor space of the greenhouse.

2. The best time to use the aerosol agent is: to carry out at dusk and sunset, and to smoke at night.

3. Cloudy, rainy and snowy temperatures can also be applied in daylight.

Fourth, master the way of taking medicine, set up 3-5 fireworks points per acre, and set up 3-5 fireworks points per acre, and ignite them successively from the inside to the outside after the closed greenhouse, and smoke for 6-7 hours. 2. Smoke once every 6-7 days, and continue to smoke 2-3 times. 3. Frequently Asked Questions:

In the whole process of fumigation, the staff enter the greenhouse, and they can only enter after the greenhouse is smoked after natural ventilation.