What are the causes of pesticide damage to greenhouse plants? What to do?

Causes: The drugs used are inaccurate, the drugs used are counterfeit and shoddy products, and the concentration of drugs used is too high. Response: Choose drugs with low toxicity but good efficacy, purchase qualified drugs through formal channels, improve the professionalism of drug use by practitioners, and use drugs rationally.

The use of a large number of chemical fertilizers, the use of unfermented organic fertilizers, water-soluble, oily, and inappropriate acidity and alkali pesticides can easily lead to plant root rot. Irrigation of plant roots, a large amount of irrigation helps to dilute the drug fertilizer and increase the water content of root cells. Spray antidotes or conditioners on the affected plants.

Pesticide incidents are often inseparable from the influence of pesticides, plants and the environment, most of which are caused by the pesticides themselves or the poor temperature and humidity environment when pesticides are used. Broad-spectrum and protective fungicides can be preferred, such as biological agents, carbendazim, chlorothalonil, etc.

When planting vegetables and fruit trees in greenhouses, there are often fertilizer damages, and these situations will be encountered, so find the right way to solve them, and the crops will grow better, so that the harvest will be more.

When planting fruit trees and vegetables, there will be fertilizer damage or drought, drought and medicine damage, or lotus tea obstacles, these four pests have a very large impact on crops, otherwise the harvest of vegetables is very low, and the income will be very bleak, so farmers who plant greenhouse vegetables and fruit trees must solve this kind of problem, so as to find a way to prevent and control. The first thing that should be understood is fertilizer damage, in fact, it is the harm of myositis in the land, when the application of excessive or too little fertilizer will cause salinization of the land and cause harm.

When the salinization of the soil is too severe, the root development of vegetables will be inhibited, and the absorption function of fertilizer water transfer will be weakened, and the concentration of lava liquid in the soil will be relatively large, and vegetables will wilt. Or some toxic gases enter the land, so that vegetables appear deficient. The prevention and control measures of this kind of fertilizer damage also need to be paid attention to, usually eat more organic fertilizer, so that vegetables can grow steadily, and perennial fertilization must eat some rotten farm fertilizer will be better, if you apply some fertilizer must choose suitable for the land can be some nitrogen and phosphorus fertilizer or some micro fertilizer is better.

You can also eat some active liquid fertilizer in the land, which can also alleviate the harm. In addition to this situation, there may also be pesticide damage, so you think that the growth of vegetables will also appear in this situation, do not misuse herbicides or apply pesticides when weeding, and the concentration of pesticides can not be too large, and buying inferior pesticides will also affect the growth of crops. And avoid eating pesticides when it is hot, so that vegetables and fruits will have some bad conditions, and in serious cases, they will wilt.

High temperatures should be avoided when testing drugs, and the dose and concentration of pesticides should be controlled.

There were vital points, soil diseases, crop diseases, some pest problems, some fertilization problems. In the face of such a problem, the soil should be conditioned in time, and the crops should be disinfected and sterilized in time.

There is a problem with the root development of vegetables, there is no way to grow normally, which seriously affects the yield, and in this case, we must pay attention to watering and use fertilizer reasonably.

There may be pesticide damage, or fertilizer damage, germ problems, incorrect fertilization methods, or excessive fertilization. It should be dealt with according to the control method in this area, as well as the effect of balanced fertilization, and the specific coping skills should be understood.

How to deal with the symptoms of pesticide damage in the shed vegetables?

According to the field pests and diseases, seedlings correctly select pesticides, master the scientific usage. The pesticide resistance of vegetable crops at the seedling stage is obviously weaker than that at the adult stage, so it is necessary to spray pesticides, and the concentration of the liquid must be small. When dispensing, do not blindly mix a variety of pesticides (fungicides, insecticides, hormones, etc.) with micro-fertilizers, increase the dosage at will, and must take the "secondary dilution method".

a. When applying pesticides, choose to use drugs under suitable conditions of temperature and humidity, and do not apply pesticides when the high temperature is above 30 and the humidity is lower than 50%. When there are many pests and diseases, try not to repeat spraying, especially sensitive pesticides, which are prone to spot and flake pesticide damage.

How to diagnose vegetable pesticide damage.

1.Within a few days after application, the seedlings in the field appeared abnormal, such as dry leaves, spots, small curls of heart leaves, flower and fruit drops, etc.

2.After sowing, the seedlings are incomplete or rotten buds, the root system is not rooted or there are few new roots after planting, and the seedlings on the ground are dry and do not grow. In these cases, it is necessary to investigate the application of pesticides in the last crop, such as paclobutrazol and herbicides in the last crop, and the planting of tomatoes and other vegetables in the next crop, which is likely to cause dwarfing of the plant.

After the use of simazine herbicide in corn fields, it often causes pesticide damage to crops such as rape and beans.

b3.The symptoms are that the whole shed occurs, the onset is fast, there is no disease center and pathogenesis process, and the symptoms of the victim are atypical, such as irregular spots, different sizes, no mold layer and ring pattern, yellow halo, etc.

Keep track of the timing of your medications. The temperature is high during the day, the water evaporates quickly, and the concentration of the liquid medicine is easy to increase after spraying, especially at noon, and the risk is very high. We should choose to use the drug before 10 a.m. or after 16 p.m. to reduce the occurrence of drug damage.

In addition, it is necessary to always pay attention to weather changes, and take medication 1 or 2 days in advance before rainy weather comes.

cSecondly, the combination of drugs should be reasonable. When the incidence of pests and diseases is high, a variety of pesticides are needed for control, and we can choose to mix and add a variety of pesticides, so that chemical reactions between different pesticides can not only not achieve the control effect, but also lead to the occurrence of pesticide damage.

I think we should control weeds, and I think we should touch some pesticides to prevent pests and diseases, so it is good for vegetables, so I think it's okay.

It is necessary to immediately spray the corresponding insecticides, and apply nitrogen and potassium fertilizers to improve the disease resistance and insect resistance of crops, promote the absorption of nutrients by plants, pay attention to ventilation and exhaust, ensure the reasonable humidity and temperature, and increase the intensity of light intensity.

Appropriate pesticides should be used for insecticide, the temperature should be adjusted, and a good environment should be given to the vegetables.

1. The trait of drug resistance existed before the use of pesticides, and after the use of pesticides, the individuals who were not resistant to the drugs were killed. Resistant individuals survive to reproduce, and the offspring also inherit the resistance. It is manifested by a larger proportion of resistant individuals. 2. Right.

Why is it not pests and diseases that destroy your greenhouse vegetables, but pesticide damages?

What should I do if I use it incorrectly?

If the vegetables in the shed have symptoms such as wilting and death of the parietal leaves and leaf edges, after opening the tuyere and thoroughly releasing the air, sweep away the water droplets on the roof film of the shed, spray love more in time, brassinolide, etc., apply well-rotted organic fertilizer, top dressing to eat less and eat more meals, prevent overdose and other measures to rescue.

This is the first common type of pesticide damage, tobacco pesticide damage. The following is the second type of drug harm that often occurs, hormone drug damage.

Nowadays, the use of plant growth regulators has become very common, such as gibberellin, mequatin, ethephon, etc. are commonly used in vegetables. To be honest, these hormone drugs have a good effect on increasing vegetable yield and improving quality. At the same time, if we use it improperly, it is often harmful.

Such as excessive spraying of paclobutrazol, mequaticin, etc., often cause vegetables not to grow, which has to be sprayed with antidotes, such as Aiduo, gibberellin, brassinolide and other growth promoters.

If the dosage is too large, it will often cause tomato fruit deformity, such as peach-shaped fruit, spire-shaped fruit, tumor-shaped fruit, eccentric fruit, bean-shaped fruit, etc., and hollow fruit, cracked fruit, etc.; Dropping on the leaves will cause the leaves to be distorted, slender and bent, and the new leaves will not spread.

If there are symptoms of this pesticide damage, we have to spray gibberellin in time to rescue, and at the same time strengthen the application of phosphorus, potassium fertilizer and organic fertilizer. However, nitrogen and potassium fertilizers should not be applied to split fruits, and calcium fertilizers and boron fertilizers should be supplemented in time.

Although gibberellin can alleviate hormone damage, excessive use of gibberellin will also cause drug damage, if the fruit is stiff, cracked, fruity and astringent, and the plant is greedy for green and late ripening. For gibberellin damage, paclobutrazol must be sprayed to inhibit the synthesis of gibberellin in the plant itself, and at the same time spray anti-falling hormone to relieve the symptoms of hormone poisoning.

No matter what kind of hormone overuse causes pesticide damage, it is necessary to strengthen management, such as increasing greenhouse temperature, strengthening water and fertilizer management and other agricultural measures, enhancing the nutrient supply of plants, and promoting the absorption of nutrients by vegetable roots, which can speed up the recovery and minimize the loss.

It is not pests and diseases that destroy your greenhouse vegetables, but your temperature is too high, and the damage of this drug is very great, so you must pay attention to the amount when using it, so as to achieve the effect.

The author has been engaged in the promotion of facility cultivation technology for more than 20 years, and found that whether it is greenhouse fruit tree cultivation or vegetable cultivation, almost more than 90% of indoor crops have pesticide damage, and a large proportion of them are serious pesticide damage.

Crop leaves appear dark and dull, the leaf surface is rough and hardened, which is a mild pesticide damage, the leaves become thicker and brittle, and the leaf edge necrosis and yellowing are more serious pesticide damages, and the leaves are dry and necrotic in some cases.

Once pesticide damage occurs in greenhouse crops, it will inevitably cause leaf aging, hardening, photosynthesis is hindered, and photosynthetic efficiency is greatly reduced, resulting in yield reduction, or even serious yield reduction.

Nowadays, many people in rural areas use a lot of drugs in order to get rid of pests and diseases. This is very bad for vegetables.

1. The sensitivity of the plant itself, the sensitivity of the seedling stage, flowering stage, germination stage, fruit setting stage, etc. is different 2. The efficacy volatilization of drugs is affected by temperature, light, humidity and wind 3. The concentration of drugs and spraying methods are affected.

4. The mixing of drugs has an effect, and the water used for dilution has an effect.