Bordeaux liquid is an inorganic copper bactericide, which has been used for many years in pesticide planting in China. There are many misunderstandings in its use. Some farmers believe that Bordeaux mixture is an alkaline pesticide and cannot be mixed with imidacloprid, acetamiprid, ethylphosphorus and the like.
The first thing to say is that Bordeaux mixture is a weakly alkaline agent mixed with copper sulfate and quicklime. It does not react strongly with acidic agents, and it does not immediately neutralize the efficacy of insecticidal fungicides.
Insecticides can be added: imidacloprid, acetamiprid, thiamethoxam, high chlorinated horse, and high-chlorine.
Killing red spiders can be added: avidemazole, methyl cyanide and so on.
Foliar fertilizer can be added: Ou Tianjia and so on.
Pre-harvest fruit drop can be added: naphthaleneacetic acid.
Important reminder:
The amount of insecticide and bactericidal added should be increased by about 30% (for example, 1000 times in normal times and 700 times in Bordeaux mixture), it must be used now, and should not be left for too long.
Here are a few recipes for the Bordeaux mixture:
Secret One: Bordeaux + + ammonium bicarbonate 330 times
The combination of the two can not only play the role of foliar fertilizer, but also effectively kill apple aphid and red spider. The effect on apple, pear and grape for many years is very unique.
Secret 2: Bordeaux + carbendazim
Bordeaux mixture is a protective fungicide . Adding carbendazim (systemic fungicide) can play a dual role of protection and treatment; it can protect and treat various diseases of apple. Bordeaux mixture has a good protective effect on epidemic rot, brown spot, anthracnose leaf blight and spotted leaf disease, while carbendazim has a good effect on apple rotten fruit, anthracnose fruit and dried rot fruit.
Secret 3: Bordeaux + Fumei
The combination of the two has a good effect on the treatment of grape white rot, and the Bordeaux mixture has a good protective effect on various diseases of grapes.
Secret Four: Bordeaux + Ethium Phosphate
The combination of the two can also protect and cure the grape downy mildew, and the effect is very unique.
Secret Five: Bordeaux + Anthrax Fami
The combination of the two is very good for the protection and treatment of grape anthracnose and apple anthracnose.
Secret 6: Bordeaux + urea
The combination of the two, the effect of the weak tree is very good.
Secret Seven: Bordeaux + Washing Powder
The combination of the two, strong anti-raining ability, is conducive to improving the efficacy of the drug, and can cure mites.
Secret Eight: Bordeaux Liquid + White Sugar
The two together, it is very good anti-precipitation, and the exhibitability is also very strong.
For friends who have doubts, you can take a few trees to test the effect. It should be noted that after the Bordeaux mixture is prepared, the above-mentioned agent is added, and it must be used now and must not be placed for a long time. Not only do Bordeaux liquids, but also other medicines. The choice of medicines is good, the varieties are well matched, and the time is well mastered to get good results!
Bordeaux liquid use contraindications:
Bordeaux mixture is a protective fungicide that inhibits the spore germination or mycelial growth of pathogenic bacteria by releasing soluble copper ions. Under acidic conditions, when a large amount of copper ions are released, the cell protoplasm of the pathogen can be coagulated and sterilized. In the case of high relative humidity, dew or water film on the leaf surface, the drug effect is better, but the plant with poor copper resistance is susceptible to phytotoxicity. It has a long-lasting effect and is widely used to control a variety of diseases such as vegetables, fruit trees, cotton, and hemp. It is especially effective for leaf diseases such as downy mildew and anthracnose, and potato late blight.
Bordeaux mixture itself does not have a bactericidal effect. When it is sprayed on the surface of plants, it is adsorbed on the surface of the crop due to its adhesion. In the process of metabolism, plants secrete acidic liquids, and the acidic substances secreted by bacteria invading plant cells, so that a small amount of basic copper sulfate in Bordeaux mixture is converted into soluble copper sulfate, thereby producing a small amount of copper ions (Cu2+). After Cu2+ enters the pathogen cells, the proteins in the cells are coagulated. At the same time, Cu2+ can also destroy certain enzymes in its cells, thus preventing the metabolism in the bacteria from proceeding normally. Under the influence of these two effects, bacterial poisoning can be killed.
1. Bordeaux mixture is a plant protection agent and should be sprayed before or during the onset of the crop. In the morning when the dew is not dry or wet and rainy, or at noon on sunny days when the temperature exceeds 30 °C, the application of Bordeaux mixture should be avoided, otherwise it is prone to phytotoxicity.
2, Bordeaux mixture can not be mixed with stone sulfur mixture, rosin mixture, etc., the interval between the two drugs is 15 to 20 days, otherwise phytotoxicity will occur. The fruit is stopped 20 days before harvesting. Bordeaux mixture can not be used in the first half of the harvest. Some apple varieties (golden crowns, etc.) are sprayed with Bordeaux mixture and the fruit is easy to produce fruit rust. Other pesticides can be used.
3, spray should be uniform, the drug drops can not be too large, so as not to allow excess liquid to flow from the leaf surface.
4. Fruit trees that are prone to phytotoxicity should be used with caution. When applying, refer to the sensitivity of the main fruit trees to pesticides. Such as peach, plum, apricot, cherry and other stone fruit trees, etc. Long-term use of Bordeaux liquid is prone to phytotoxicity leading to defoliation, use time and concentration, should be passed through a small area test, and then widely used.
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