Copper preparations are characterized by low toxicity and environmental friendliness. They are effective against both fungal and bacterial diseases. They have both protective and curative effects. The liquid adheres strongly to the crops and is resistant to rain erosion, which can prevent germs from invading for a longer period of time. The control effect is good, and the bacteria are difficult to produce drug resistance.
At present, the inorganic copper preparations that have been developed and applied include basic copper sulfate, cuprous oxide, and copper hydroxide. The organic copper preparations include Thiobacillus copper, Urea copper, and rosin acid copper. At the same time, there has also been a variety of copper formulations and other fungicides mixed agents, such as Phytopathogenic spirit 1.5% alkanol sulfate copper water emulsion and so on.
The long-term continuous use of copper preparations can easily lead to the occurrence of apes. Many years of production practice have found that long-term use of copper preparations on cotton to prevent and treat keratopathies, anthrax, seedling blight, etc., can easily cause the early occurrence and multiple occurrence of cotton leafhoppers, resulting in cotton defoliation; prevention of beans, peppers, and copper preparations. Tomatoes, eggplants and other vegetable diseases, anthracnose, bacterial wilt, etc., can easily cause a lot of oviposition, proliferation of the tea plant, causing the leaves to dry off.
There are three main reasons why the use of copper preparations causes the occurrence of apes. First, the bactericidal mechanism of copper preparations is the rapid release of copper ions, the destruction of pathogenic proteases, the death of pathogens, no killing effect on fleas; Second, copper ions can add trace elements, promote plant growth, so that fruit and vegetables are bright and colorful, Trapping pupa habitat, feeding and breeding; Third, copper preparations have a killing effect on the natural enemies of crickets, resulting in the occurrence of crickets.
In the aphid-prone areas or dry seasons, copper preparations should be used interchangeably with other types of fungicides. Do not use them repeatedly.
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