What are the causes of Bordeaux liquid drug damage?

1. When preparing Bordeaux liquid, the copper sulfate is not completely dissolved, and spraying it on the fruit together with the residue will make the fruit appear reddish-brown pesticide spots and reduce the commodity value of the fruit. 2. The use of Bordeaux liquid in the young fruit stage of apples and when the fruit is about to ripen will cause rust spots on the fruit surface, rough peel, and reduced finish, resulting in a decrease in the appearance and quality of the fruit. 3. Peach, apricot and plum trees are sensitive to copper during the growing season, and the use of Bordeaux liquid is very prone to copper ion poisoning, resulting in leaf drop and fruit drop.

When the amount of lime in Bordeaux liquid is lower than the double formula, apples, especially golden crown varieties, hawthorn and persimmon trees, are prone to pesticide damage. When the lime content is higher than that of the equivalent formula, grape longan, seedless purple, Chana and other varieties are prone to pesticide damage.

It is very likely that the copper ions cause the disease, so at this time the leaves will turn yellow, and will slowly dry up, because of the incomplete dissolution of the pesticide, may be because of the high temperature weather when used, or may be because of the mixture with other pesticides, the interval is relatively short.

Because Bordeaux liquid is used too many times, the frequency of Bordeaux liquid is too high, and the concentration of Bordeaux liquid is too high, it is used without diluting Bordeaux liquid, and the damage of Bordeaux liquid to crops is too high.

The main chemical component of the pesticide Bordeaux liquid is copper sulfate. Copper sulphate (chemical formula: CuSO4), white or off-white powder, commonly known as bile alum, bile alum, bile alum, blue alum.

Its aqueous solution is weakly acidic and blue. Copper sulphate is an important raw material for the preparation of other copper-containing compounds. When mixed with lime milk, Bordeaux liquid can be obtained, which can be used as a fungicide.

At the same time, copper sulfate is also an electrolyte in copper electrolytic refining. The common form of copper sulphate is crystal, which is copper sulfate tetrahydrate ([Cu(H2O)4]SO4H2O, copper sulfate pentahydrate, which is a blue solid (crystal). Its aqueous solution is blue due to hydrated copper ions, so anhydrous copper sulfate is often used in laboratories to check for the presence of water.

In real life, copper sulfate is often used to refine copper and mix it with hydrated lime to produce pesticide Bordeaux liquid. Properties: It can be decomposed into black copper oxide, sulfur dioxide and oxygen at high temperatures.

Soluble in water, insoluble in ethanol. Under the action of air, copper reacts with concentrated sulfuric acid or copper oxide dissolves in dilute sulfuric acid, and then evaporates and crystallizes. used as ammonia fixation catalyst, cotton silk mordant, wood preservative, agricultural insecticide, water quality fungicide, medical emetic

Anhydrous copper sulfate is used as a raw material for electroplating, dyeing, leather industry, as a dehydrating agent and gas desiccant. Uses:1

Analytical reagents: used for the determination of reducing sugars in cautery reagents and Bannar's reagents. In the reaction, divalent copper ions are reduced to monovalent insoluble red precipitated cuprous oxide.

Copper sulfate can also be used to detect proteins with biuret reagents. Copper sulfate can be used to detect anemia. A drop of the blood sample is placed in a solution of copper sulfate.

If the blood sample contains enough hemoglobin, the blood sample will sink quickly. If the hemoglobin content is insufficient, the blood sample will be suspended in solution. 2.

Organic synthesis: Copper sulfate can be used in organic synthesis. Anhydrous salts are used to catalyze acetalization.

Anhydrous salts react with potassium permanganate to form an oxidizing agent for the conversion of primary alcohols. 3.Agriculture:

Copper sulfate can be used to kill fungi. When mixed with lime water, Bordeaux liquid is produced, which acts as a fungicide to control fungi on crops such as lemons and grapes and prevent fruit rot. The diluent is used for aquarium sterilization and snail control.

In crop cultivation technology, Bordeaux liquid is applied at high temperatures, which is prone to lime-induced pesticide hazards. In the case of the complexation of copper ions in Bordeaux liquid, copper ions are generally sprayed on the surface of leaves and fruits before being released slowly, giving full play to the antibacterial effect and being relatively safe for peach trees. The use of Bordeaux wine during the tender period and when the fruit is close to ripe will cause rust on the surface of the fruit, the skin will not be smooth, and the flatness will be reduced, resulting in a decrease in the shape and quality of the fruit.

When the amount of lime in Bordeaux liquid is less than that of multi-dose type, it is easy to produce copper ion toxicity, resulting in leaf wilting and fruit dropping. Bordeaux liquid is mixed with dimethoate, bacteria, mancozeb or alternately applied, and the time interval is too short, which is easy to cause drug harm. At the same time, when the concentrated Bordeaux liquid is applied, the peel loses its smoothness, the heart becomes smaller, the fruit surface turns yellow, and it is easy to absorb copper ions.

After spraying in the canopy, the concentration of active ingredients in the outer canopy increased significantly, but the concentration of copper ions in the canopy was not easy to reach the peak, and the proportion of pesticide damage in Bordeaux liquid was high.

Bordeaux liquid can be used in combination with calcium fertilizer, with calcium fertilizer as the carrier, to improve the absorption and utilization of calcium fertilizer, and increase the absorption and utilization rate of calcium fertilizer. The combination of Bordeaux liquid and phosphate fertilizer, with potassium dihydrogen phosphate as the carrier, can improve the absorption and utilization rate of Bordeaux liquid and improve the quality of phosphate fertilizer. Bordeaux liquid can be used in combination with chemical fertilizers, and evenly sprayed on the soil of the orchard before fertilization, so as to facilitate the effective mixing of Bordeaux liquid and chemical fertilizers and improve fertilizer efficiency.

Bordeaux liquid is used in combination with pesticides, using pesticides as carriers to improve the dissolution effect of pesticides and reduce pesticide residues. The combination of Bordeaux liquid and herbicide can effectively control the pesticide damage of herbicides to Bordeaux liquid and prevent weeds. Bordeaux liquid is used in combination with plant growth regulators, with plant growth regulators as the carrier, which has the function of regulating plant growth and making plant growth healthier.

Bordeaux liquid is used in combination with antifreeze, with antifreeze as the carrier, which can maintain the best effect of Bordeaux liquid and slow down the rate of frost damage.

There is still a lot to know, it may be because the effect of this pesticide is relatively large, it may be because it has expired, it may be because it has some reactions with other crops or ***, it may be because this pesticide is mixed with other crops when it is used.

This is because the dosage is too large, too frequent, and the air is relatively humid and does not volatilize, so there is a pesticide damage.

I didn't grasp the concentration of Bordeaux liquid, I didn't pay attention to the time of spraying, I didn't grasp the frequency of spraying, I didn't find the root of the problem, and I used drugs at will.

It may harm a lot of crops, and there will be a lot of chemical reactions, there will be problems with drug efficacy, pay attention to the frequency of spraying drugs, and do not use them with dosage at will.

What diseases can Bordeaux liquid prevent?

Bordeaux liquid is an excellent protective fungicide, widely used in fruit trees, vegetables and cash crops, and has a good control effect on downy mildew, cotton rot, anthracnose, seedling cataplexy caused by fungi.

1. Prevention and control of apple rust and dry rot: spray 1 2 times from the germination of fruit trees to the young fruit stage. The ratio of Bordeaux liquid is 1:2:200 (1 part copper sulfate, 2 parts quicklime, 200 parts water, the same below).

2. Prevention and control of apple anthracnose, ring disease, and early defoliation: According to experience, 10 14 days before the appearance of diseased fruits, spray Bordeaux liquid once every 15 20 days, and stop 20 25 days before the fruit harvesting period, a total of 5 6 sprays. The ratio is 1:

3. Prevention and control of pear rust and brown spot: From the beginning of the pear tree leaf development period, spray once every 10 days or so, and spray 3 times in a row. The ratio is 1:2:200 240.

4. Prevention and treatment of pear scab: Start from the discovery of diseased shoots or diseased flowers, spray once every 10 20 days. The ratio is 1:2:200 240.

5. Prevention and control of grape black pox: spray grapes once before and after flowering. The ratio is 1::200.

6. Prevention and control of grape anthracnose, downy mildew and house blight: 7 In the grape growing season in September, spray once every 15 days. The ratio is 1::160.

7. Prevention and control of vegetable or other crop diseases: It is necessary to spray pesticides before or at the beginning of the occurrence of diseases.

Bordeaux liquid is a protective fungicide, mainly to prevent various fungal and bacterial diseases, once the disease occurs, the effect is not good.

It is a fungicide, not an insecticide.

It has the effect of sterilization and disease prevention on plants. Bordeaux liquid does not kill insects.

Bordeaux liquid is a good protective agent against a variety of fungal diseases, oomycete diseases and bacterial diseases.

Conclusion:The use of Bordeaux liquid should be sprayed before the occurrence of the disease, the prevention effect is very good, if the disease has been spreading, the effect is poor.

Bordeaux liquid can prevent mycosis and rhizobia of plants, and can reduce plant pathogens.

It seems that you can do it, you can do it, this Bordeaux solution is quite powerful.

Bordeaux sap mainly controls plant pests and diseases: spider mites, and aphids.

Bordeaux solution inhibits spore germination or hyphal growth of pathogenic bacteria by releasing soluble copper ions.

Under acidic conditions, when copper ions are released in large quantities, they can also coagulate the cell protoplasm of pathogenic bacteria and play a bactericidal role.

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When used in a high temperature environment, the pants search and the use of Bordeaux liquid in the young fruit period of the fruit will be prone to pesticide damage, we must pay attention to it, so that we can make the crops grow better.

Bordeaux wines are made from high-quality, pure, white, light block lime and copper sulphate with blue crystals, using selected raw materials. If it is a yellow or green powder, it must not be used. Strictly follow the preparation procedures.

When dispensing, first dissolve the copper sulfate in a non-metallic container with an appropriate amount of hot water, then filter, add 90% of the total water, and then filter out the residue that must be dissolved.

Bordeaux liquor should be mixed reasonably and should not be mixed with stone sulfur mixtures and fungicides. When Bordeaux liquid is mixed with organophosphorus pesticides, care should be taken and can be used at any time. Pay attention to changes in the weather.

Bordeaux liquids should be sprayed in full sunlight and without dew. Spraying in the hot summer should avoid the high temperature at noon, and avoid the key caused by lime in high temperatures. When spraying during the rainy season, try to avoid rainy days.

Bordeaux liquids should not be sprayed when they are wet and the dew is not dry, otherwise copper ions can penetrate into the plants, causing serious drug damage. Therefore, Bordeaux liquids should be sprayed when there is plenty of sunlight and no dew. When spraying in the rainy season, try to avoid rainy days and increase the amount of lime appropriately when dispensing.

Bordeaux liquid is a protective fungicide that should be used before the fruit trees begin to grow and stopped 15-20 days before the fruit harvest to avoid contaminating the fruit surface. Peach, plum, apricot and other fruit trees that are particularly sensitive to copper should not use Bordeaux solution during the growing season. The Bordeaux solution should not be used within 1 month after the apple has fallen and when the fruit is close to ripe to prevent rust spots on the surface of the fruit or affect the coloration.

When fungicides need to be sprayed at this stage, carbendazim, methyl tobuzin, etc. can be used.

Different species of fruit trees have different sensitivities to Bordeaux sap, and different ratios should be selected according to their sensitivities. For copper-sensitive fruit trees, there are a variety of limes or a variety of types to choose from. For pear trees that are not sensitive to lime or copper, a lime equivalent formulation can be chosen.

For grapes that are sensitive to lime and have a strong resistance to copper, you can choose half the amount of lime.

If the Bordeaux liquid is not used properly, there will be some pesticide damage, and the Bordeaux solution should be used reasonably, and the lime aqueous solution sprayed in the early stage of the pesticide damage can slow down the release rate of copper ions and reduce the pesticide damage.

There are often the following four situations in which drug damage occurs:1After spraying, the liquid medicine is not dry when it rains, or the dew on the leaves is not dry, which is easy to cause leaf burns; 2.

When preparing Bordeaux liquid, the copper sulfate is not completely dissolved, and spraying the residue on the fruit will cause reddish-brown pesticide spots on the fruit surface; 3.It is also prone to pesticide damage when mixed with stone sulfur mixture, antibacterial special, etc., or the spraying time interval is too short (less than one month); 4.After a period of time after the Bordeaux liquid spray, when there is a large wind and rain, the copper ions on the leaf surface will also increase, so that the leaves will be scorched, and "wind and rain pesticide damage" will occur.

In the preparation and use of Bordeaux liquid, it is necessary to pay attention to: (1) high-quality quicklime should be selected, and copper sulfate should be fully dissolved to avoid precipitation. The Bordeaux liquid used in the rainy season should increase the amount of quicklime when it is prepared, and it is safer to use double or multi-dose formula (1 part copper sulfate plus 4 5 parts quicklime).

2) Choose sunny and rainy weather when spraying, and avoid using it when there is dew in dry nights. (3) For the agents that should not be mixed, such as stone sulfur mixture, antibacterial special, etc., should not be mixed. Even if you use it, you should wait for a certain amount of time.

It is because the pesticide has not completely dried up, and then it rains, and then the pesticide is washed away, causing the leaves to be burned, and it may not be prepared in place, and it is not completely dissolved, and the way to prevent it is to carry out regular operations, choose clear weather, and use pesticides.

It is because when the preparation is made, it is not completely dissolved, and it rains immediately after the application of the pesticide, so the pesticide damage occurs, and it is necessary for professional people to configure and use pesticides in sunny weather, so that it can be prevented.