How often should pesticides be used in vegetable gardens?

First, the pesticide fungicide 75 mancozeb wettable powder should be applied 7 days before the sale; 77% can kill wettable powder for 3 5 days; 50 Promethanin WP 4 7 days; 70 hydroxytobuzin wettable powder 5 7 days; 50 Nonliling WP 4 5 days; 50 Gary 58 Rhizin Thunder Manganese Zinc WP 2 3 days; 64 disinfectant alum wettable powder 3 4 days.

Second, the insecticide 10 fenmethrin EC 2 5 days; bromopermethrin for 2 days; Time: EC 7 days; 5 Riflin EC for 3 days; 5 Anti-aphid wettable powder for 6 days; 10. Quickly destroy the enemy's emulsifiable concentrate for 3 days, and Lesben emulsifiable concentrate for 7 days; 20 Aceoli EC for 3 days; 35 Optimal thionphos period of 7 days; 20 The safety interval of deltamethrin EC is 3 days; 10 Mapelik EC safety interval of 7 days; Quethion-25 EC safety interval 9 days; 50 The safety interval of anti-aphid wettable powder is 6 days; 5 The safety interval of multi-lebro WP is 7 days.

Third, the safety interval of acaricide 50 bromodifen emulsifiable concentrate is 14 days; 50 Dazik WP safety interval of 7 days. A few days ago, our country was constantly cloudy and foggy in temperature, and there was strong convective weather after rain and snow, which was extremely bad for the growth and development of vegetables in the maintenance equipment. In order to ensure the normal growth and development of vegetables in the maintenance equipment, China's scientific research experts especially suggest that farmers should see more of it to improve solar thermal power generation.

At this stage, the winter stubble vegetables in the shed are in the picking period, and the spring and winter stubble vegetables are in the emergence of seedlings. In the absence of sunlight or low sunlight, the high efficiency of photosynthesis of vegetables will be reduced, and the growth of the main stem will be stunted. In addition, the low light temperature is not conducive to the rise of the temperature in the shed, which endangers the growth and development of vegetables, and makes the main stem rise after the strong sun, which is very susceptible to diseases.

Agricultural and animal husbandry experts believe that vegetable greenhouses all over the country should use diffuse light on rainy days as much as possible, and untie the grass around the afternoon to ensure that the main stem sees light every day under the condition that the room temperature does not decline. If the room temperature is constantly decreasing, special attention should be paid to manpower to fill the calorific value and increase the indoor temperature to ensure that the main stem is not affected by cold.

The interval can be chosen for 14 days, and there is a particularly good planting in the vegetable garden. A lot of farmers do that now.

Two days is the best, so that it can be sterilized and disinfected, and it does not harm the crops, so that the crops can grow better.

It will take about a week, and then the effect of the medicine will be better, and it will not affect the normal growth of crops and will not harm human health.

It is more reasonable to use pesticides in the vegetable garden, preferably at intervals of about a week, so that the pesticides can be effective as soon as possible.

Many farmers usually do not pay attention to the safe time interval before the vegetables are put on the market when applying pesticides to prevent pests and weeds, resulting in a large amount of pesticide residues on the vegetables. In order to better enable customers to eat safe and secure vegetables, vegetable growers should pay great attention to the interval between pesticide use to ensure safe use and safe eating.

When some farmers use pesticides to prevent pests, diseases and weeds, they usually do not pay attention to the safe medication interval before the vegetables are put on the market, resulting in excessive pesticide residues on vegetables. Therefore, many farmers are reminded to improve their understanding and pay attention to the interval between the marketing of vegetables after taking medicine to ensure that vegetables are pollution-free. Below, the author will share with you how long is the safety interval of common pesticides in vegetables?

1. Pesticide fungicide.

75% mancozeb wettable powder applied 7 days before marketing; 77% can kill WP for 3 5 days; 50% promethane wettable powder for 4-7 days; 70% thiophanate-methyl wettable powder for 5 to 7 days; 50% Nonliling WP for 4 to 5 days; 50% Gary 58% Rhizva Thunder Manganese Zinc WP for 2 to 3 days; 64% disinfectant alum wettable powder for 3 to 4 days.

2. Insecticides.

10% deltamethrin EC for 2 to 5 days; Permethrin.

for 2 days; Time emulsifiable concentrate is 7 days; 5% Leflin EC for 3 days; 5% anti-aphid wettable powder for 6 days; 10% quick-kill emulsifiable concentrate for 3 days; Lesburn.

emulsifiable concentrate for 7 days; 20% emulsifiable concentrate for 3 days.

20% fenvalerate emulsifiable concentrate for 5 days; The 35% thionphos period is 7 days; 20% deltamethrin EC for 3 days; 10% mapelik EC for 7 days; 25% quinthion EC for 9 days; 50% anti-aphid wettable powder for 6 days; 5% multi-Plebro WP for 7 days.

3. Acaricide.

50% bromodifen EC for 14 days; 50% Dazik wettable powder for 7 days.

Keep an eye out: methamidophos.

Methyl parathion, parathion, monocrotophos, phosphine, phosphine.

Hydroxyisosulfonate, tert-butylthion, hydroxythiocyclophos, phosphine, systemic phosphorus, carbocarb, aldicarb, methropha, thiocyclophos, fly toxin, thiathion, chlorazophos, benzophos, dimethoate, sodium pentachlorophenol contour.

Toxic and high residue pesticides should not be applied to vegetables.

The pesticide safety interval mentioned above refers to the minimum number of days for the pesticide residue in agricultural products to achieve the specified value after the application of organic chemical pesticides and the selection of all normal concentration values to prevent a certain type of disease.

The safety interval is about half a month, and it is best to eat vegetables after spraying pesticides for a long time to avoid pesticide poisoning.

Generally, it is about three days to five days, and within this time, the efficacy of pesticides is relatively high, and then sometimes it is around 7 o'clock.

The safety interval should be about 3 to 7 days, mainly according to the different pesticides, so there are different safety intervals.

It depends on the type of herbicide and the crop you are growing.

1. If it is a soil-closed herbicide, it is best not to plant vegetables with seeds, because it can cause pesticide damage to newly unearthed vegetables, and the pesticide damage will remain for a long time, and even affect the next crop.

2. If it is a selective herbicide, as long as it is not for the vegetables you plant, you can choose to plant vegetables on the same day, if it is a herbicide for the type of vegetables you plant, you must wait until the end of the residual period of the effect before planting.

3. If it is an incidistric herbicide, it is necessary to determine its main components, if it does not have an endogenous type, it can be a few hours to a few days, if it has an endogenous type, it is best to wait for more than 2 weeks, and generally the herbicide residue period can reach a month for a long time.

4. It is suggested that before planting vegetables, degrade residues in advance, and use weeding safety additives to plant safer after reducing residues.

There is a standard time.

With the different climate and environment, the time of pesticide residues in vegetables is also different, generally speaking, spring and summer, the temperature difference does not change much, the time of pesticide residues is about 7 days to ten days, and in the summer, the temperature increases and the weather is hot, the time and intensity of evaporation caused by sunlight become larger, and the volatilization of pesticide residues is relatively block, generally in 5 to 7 days can be eaten, and in winter the climate is cold, the time of pesticide residues is relatively long, can be retained in more than 15 days.

It depends on whether it rains during the period between the spraying of pesticides and the harvest, and if it rains, it will be shallow.

Pemethoate and other pesticides because they will remain in the form of crystals on the surface of vegetables, especially green leafy vegetables, so there is no expiration date, the safest way is to wash several times with salt water, note that it should be soaked in water before washing with salt water.

I am an agricultural university majoring in animals, and my classmates are ...... in the botanical class

Both of these are organophosphorus insecticides, highly toxic and highly toxic but easy to degrade under light conditions, generally 7-10 days before the harvest of vegetables are not allowed to play pesticides, this is to give pesticides a natural degradation time.

If you plant it yourself, I think you can fully abide by this principle, absolutely do not spray pesticides 7-10 days before harvest, then there are very few pesticide residues, if you buy it, pay attention to soak it with a small amount of edible alkaline solution, organophosphorus pesticides will be hydrolyzed in alkaline fields, reducing toxicity.

Its practical use can be removed in some simple ways!

One. Baking soda soaking method.

After the pesticide application of vegetables, some pesticides can be absorbed through the roots, enter the plant body, and gradually spread to the leaves, stems, fruits and seeds and other parts, resulting in residues. The removal method is: after buying back the vegetables, you can put them in a wooden barrel or basin, rinse them with water first, change the water again, soak them in baking soda for about 10 minutes, and then rinse them several times with water, so that the organophosphorus pesticides remaining on the vegetables can be removed.

Note: Salt water can be used to kill the insects and eggs. But don't soak the pesticides in salt water, it's not scientific, but it will lock most of the pesticides on the surface of the vegetables.

Two. Skillfully use rice washing water.

Remove pesticide residues from vegetables Rice water is acidic, soak vegetables in rice water for about 10 minutes, wash with water, you can reduce the pesticide residues in vegetables.

Three. Heating cooking method to remove vegetable residue pesticides carbamate insecticides will accelerate the decomposition with the increase of temperature, so some vegetables can be heated to remove part of the residual pesticides, often used in celery, cabbage, green peppers, beans, etc. First wash the dirt on the surface of the vegetables with water, put it in boiling water and cook it for 2 5 minutes, then rinse it with water 1 or 2 times, and then put it in the pot to cook into dishes.

Four. Storage.

Remove vegetable pesticide residues pesticides in the air with the passage of time, can slowly decompose into harmless substances to the human body, therefore, for some easy-to-keep vegetables, such as winter melon, pumpkin, etc., can be stored for a certain amount of time to reduce pesticide residues. Generally, it should be stored for more than 10 days.

Five. Peeling method.

Peeling is a good way to remove pesticide contamination from the surface of vegetables and fruits. It can be used for cucumbers, carrots, winter melons, pumpkins, zucchini and many fruits, etc., be sure to rinse with water first, otherwise the pesticides contaminated on the knife will cause pollution. However, care should be taken to avoid recontamination after peeling.

When many vegetable farmers use pesticides to control pests and diseases, they often do not pay attention to the safety interval before the vegetables are put on the market, resulting in a large amount of pesticide residues on vegetables. In order to enable consumers to eat safe and secure vegetables, vegetable growers should attach great importance to the interval between pesticide applications to ensure safe application and safe consumption. The safety interval for the use of several commonly used pesticides on vegetables is described as follows.

1.Fungicides: 75% chlorothalonil wettable powder for 7 days, 77% killable wettable powder for 3-5 days, 50% promethanum wettable powder for 4-7 days, 70% thiophanate-methyl wettable powder for 5-7 days, 50% Nonlilin wettable powder for 4-5 days, 58% Ruifude manganese-zinc wettable powder for 2-3 days, 64% disinfectant alum wettable powder for 3-4 days.

2.Insecticides: 10% cypermethrin EC for 2-3 days, bromopermethrin for 2 days, time EC for 7 days, 5% Leflin EC for 3 days, 5% anti-aphid wettable powder for 6 days, Efordin EC for 7 days, 10% fast enemy EC for 3 days, Lesben EC for 7 days, 20% fenvalerate EC for 5 days, 35% fenvalerate EC for 7 days, 20% fenethon EC for 3 days, 10% mapelic EC for 7 days, 25% quinthion EC for 9 days, 50% anti-aphid wettable powder for 6 days, 5% more Noble WP for 7 days.

3.Acaricides: 50% bromodifen emulsifiable concentrate for 14 days, 50% Dazik wettable powder for 7 days.

1.Use low-toxicity pesticides. With the continuous development trend of the chemical industry, there are more and more varieties of pesticides, and a variety of drugs can be selected to prevent a certain disease.

In order to better the safety of people and animals, low toxicity should be selected under the condition that disease can be prevented. Low residue pesticide species.

2.The concentration value of the liquid should be low. After the type of pesticide used in the selection is clear, the bottom limit of the drug power range should be selected when configuring the drug.

Because of the use of lower concentrations of the potion, it is to better human and animal safety, control costs, and prevent individual resistance to residual pests, thereby increasing the life of pesticides.

3.A wide variety of pesticide replacement applications. Because there are many types of diseases in vegetable fields, the trend is faster, and spraying is frequent.

If the same drug is used continuously, the target of prevention will become resistant to the drug and become less potent. Therefore, some different kinds of drugs with similar potencies are applied in place to prevent the development of resistance.

4.Pay attention to the timeliness of taking the medicine. To put it bluntly, the timeliness of taking the drug has a two-fold meaning:

When the disease is caused, seize the opportunity to take the medicine immediately, the sooner the better, in case you miss the time to cause the best medicine; When taking the medicine, the concentration value and total number of pesticides should be adjusted according to the growth period of vegetables and fruits, because the concentration value and number of pesticides are different in different growth periods of vegetables and fruits.