On April 3, the reporter interviewed Zhang Zhicheng, a forestry engineer at the Northwest A&F University. He said that Bordeaux's solution is an inorganic copper fungicide and its control effect on fruit trees is very significant, but the fruit must be used with scientific methods. When mixing and mixing with water, pay attention to the following matters:
Note that the choice of raw materials should use pure, high quality, white quicklime blocks and pure blue copper sulfate. Note that copper sulfate should not entrap green and yellow impurities.
To master the preparation method, first take 1/3 of the water to prepare the lime emulsion, fully dissolve and filter it, and then take 2/3 of the water to prepare the copper sulfate solution and fully dissolve and reserve it. The copper sulfate solution is slowly poured into the lime emulsion, and the copper sulfate solution and the lime emulsion are slowly poured into the same container while stirring, or while stirring. Never pour the lime emulsion into the copper sulfate solution, otherwise the formulated liquid will precipitate quickly and prone to phytotoxicity. Note that the Bordeaux mixture must be used with it. The medicinal solution used on that day should be used up on the same day. It should not be stored for a long time, nor should it be overnight, nor diluted. The preparation of Bordeaux mixture should not use metal utensils, especially iron utensils, to prevent chemical reactions and reduce the efficacy.
Pay attention to the use of the drug during the rainy season, generally in the ear of fruit during the hard-core stage (from late July to early August) for the control of grape anthracnose, white rot, black pox, downy mildew and so on. Before use, 80% mancozeb should be sprayed once. After spraying for 10-15 days, spray a semi-quantity Bordeaux mixture. The spraying must be uniform and detailed. The fruit and cob must be sprayed. After the use of pollution-free pesticides, it is not appropriate to spray Bordeaux. Limonium equal amount of Bordeaux mixture (1:1:200) can be used for control after fruit harvesting.
Reasonable use of the drug Bordeaux mixture is alkaline, the active ingredient is calcium and copper, can not be mixed with lime sulfur, carbendazim, chlorpromazine, mancozeb and other fungicides, insecticides. Bordeaux fluid and fungicides, insecticides must be separated by 10-15 days.
Timely and safe use of Bordeaux mixture should avoid high temperature, high humidity weather, such as in the hot noon or dew morning spray Bordeaux fluid, easily lead to rapid increase of lime and copper ions increased, resulting in leaves, fruit burns. It is generally safer to spray after 15 o'clock.
Different crops respond differently to Bordeaux mixture and should pay attention to the safety of copper sulfate and lime to crops. The lime-sensitive crops include potatoes, grapes, melons, tomatoes, and peppers. These crops use Bordeaux mixture and are prone to phytotoxicity under high-temperature and dry conditions. Therefore, it is necessary to use lime equivalent, small or semi-quantity Bordeaux mixture. , And seedlings are generally not used. The crops that are very sensitive to copper are peaches, plums, apricots, cabbages, lettuces, soybeans, beans, etc. They should be used with caution. The Bordeaux solution can be prepared after the trial.
Rainy days, foggy days, and morning dew should not be used to avoid phytotoxicity. Can not be mixed with alkaline pesticides such as lime sulfur, the interval between two drugs is 15-20 days. The fruit is deactivated 20 days before harvest. Apple varieties (golden crown, etc.) sprayed Bordeaux mixture after the fruit is easy to produce fruit rust, can be used to change other pesticides.
Can not be made into a concentrated Bordeaux mixture and diluted with water once Bordeaux mixture is a gel suspension, relatively stable, if you add water, it will form a precipitate or crystal and affect the quality, easy to cause injury.
The copper sulphate in the Bordeaux mixture is highly toxic. If you eat Bordeaux mixture, you should eat large amounts of egg white. Avoid use in the growth period of sensitive tree species such as peach, plum, cherry, and hawthorn. Avoid spraying after the fruit trees get sick. Bordeaux fluid is a protective insecticide that is effective before onset.
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