Bordeaux fluid is a protective bactericide. The active ingredient is basic copper sulphate, which forms a thin film on the surface of plants and germs after spraying. The film is insoluble in water, but under the effect of carbon dioxide, ammonia, tree and bacteria secretion, Soluble copper ions increase gradually and have a bactericidal effect, which can effectively prevent germination of spores, prevent the infection of pathogens, and can promote the dark green color, robust growth, and improve the disease resistance of the tree. The preparation has the characteristics of long bactericidal spectrum, long-lasting bacteria, no resistance to pathogens, low toxicity to humans and livestock, etc. It is the most widely used bactericide in vegetables and fruit trees.
First, the preparation method:
Bordeaux fluids are available in equal and half dose formulations. The main ingredients are copper sulfate, quicklime and water. The proportion and the amount of added water should be determined according to the sensitivity of the tree species or vegetable species to copper sulfate and lime (less copper-sensitive copper sulphate, lime-sensitive less lime) and the control object, season and temperature. The proportion of Bordeaux fluid commonly used in production: Bordeaux lime equivalent (copper sulfate: quick lime = 1:1), half-quantity (1:0.5) and multiple (1:3?5). Water is generally 160 to 240 times. Preparation method: According to the use of boiling water (water) melted copper sulfate, with cold water soluble quicklime, to be completely dissolved, and then the two slowly poured into a standby container, stirring constantly. Or slowly pour the copper sulfate solution into the milk of lime and mix it with a Bordeaux mixture while stirring. But must not pour lime milk into the copper sulfate solution, otherwise the quality is not good, and the control effect is poor.
Second, the control object and use methods
Control early apple defoliation, anthracnose, and ring rot disease, can be sprayed after the apple is dropped lime-fold Bordeaux mixture 200 to 240 times liquid, sprayed once a month, and alternately with other fungicides, a total of 3 to 4 times . To control apple rotten disease (ringworm disease, anthrax), it can be sprayed with lime-multiple or multi-type Bordeaux mixture 200 times before 10-15 in previous years, spraying once every 15-20 days, even spraying 3 4 times, 25 days before fruit picking. For the prevention and treatment of apple mold disease, it should be sprayed lime multiple times 160 times Bordeaux fluid in the apple budding period. Prevention of grape black shank disease, anthrax, can be sprayed with a small amount of lime Bordeaux liquid 160 times, spray once every 12 to 15 days, spray a total of 2? 4 times. Control greenhouse vegetable melons, solanaceous fruit with 200-240 times the amount of Bordeaux mixture, spray once every 10 to 15 days, even spraying 3 to 4 times.
Third, pay attention to matters
Do not use metal containers in the preparation containers. Wash the sprayed medicines in time to prevent corrosion. Rainy days, foggy days, and morning dew should not be used to avoid phytotoxicity. It cannot be mixed with alkaline pesticides such as lime sulfur, and it is deactivated 25 days before fruit picking.
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