How should copper-based fungicides be used properly? Key points of application explained
How should copper-based fungicides be used properly? Please explain the application method. Copper-based fungicides, as one of the important fungicides, have the characteristics of being the earliest developed and applied, the longest used, the largest application area, the best sterilization effect, and the most uses. Copper-based fungicides can prevent and control both fungal diseases and...
How should copper-based fungicides be used properly? Please explain the application method
Copper-based fungicides, as one of the important fungicides, have the characteristics of being the earliest developed and applied, the longest used, the largest application area, the best sterilization effect, and the most uses.
Copper-based fungicides can prevent and control both fungal diseases and bacterial diseases; they have both protective and preventive effects, and also possess certain therapeutic and eradicative effects; they can be used to heal wounds, sterilize and reduce inflammation, and can also treat certain skin diseases; they can also be used for freshness preservation and anti-corrosion during fruit storage.
Because copper-based fungicides have the characteristics of low toxicity, no public hazard, and being environmentally friendly, they have become the preferred excellent fungicide for producing green food and organic fruits. Copper-based fungicides sprayed on crops have strong adhesion, forming a film of pesticide that resists rain erosion and has a long lasting effect, which can prevent pathogen invasion for a relatively long time, thus achieving good control effects. When using copper-based fungicides, diseases also find it difficult to develop resistance.
With so many advantages, copper-based fungicides will inevitably drive the development and utilization of such preparations. Currently developed inorganic copper preparations include: basic copper sulfate (Bordeaux mixture), copper oxychloride (copper oxychloride), cuprous oxide (Copper Master, Kaoshan), copper hydroxide (Kocide, Guan Jun Qing, Feng Hu An, Rui Pu 2000), etc. Organic copper preparations include: thiodiazole-copper, copper ammonia complex (Xiao Bing Ling, Ke Bing Zeng Chan Su, Jiao An Tong), copper fatty acid, copper abietate (Lu Ru Tong), copper succinate, copper dibasic acid (copper glutarate, BT), copper soap solution, copper amino acid, etc. The development and utilization of organic copper preparations has become a hot topic in fungicide production. At the same time, various mixed preparations of copper preparations with other fungicides have also appeared, such as: moroxydine hydrochloride-copper, metalaxyl-copper (Rui Du Tong), metalaxyl-aluminum-copper, copper ammonia complex-zinc (Kang Ku Ning, Kang Ku Ling), mixed amino acid copper-zinc-manganese-magnesium, Zhi Bing Ling, copper humate (843 Kang Fu Ji), etc.
However, long-term continuous use of copper-based fungicides has a problem that cannot be ignored, namely that it easily induces mite proliferation and causes mite damage. Years of observation in production have found that long-term use of copper-based fungicides on cotton to control angular leaf spot, seedling stage anthracnose, and damping-off easily causes early and frequent outbreaks of cotton spider mites, causing cotton defoliation and "stem collapse"; applying copper-based fungicides on beans, peppers, tomatoes, eggplants and other vegetables to control Phytophthora blight, anthracnose, bacterial wilt, etc., easily causes mass egg-laying and proliferation of broad mites, leading to leaf drying and shedding.
There are mainly three reasons why copper-based fungicides induce mite proliferation: First, the sterilization mechanism of copper preparations is that copper ions can quickly destroy the protease of pathogenic bacteria and cause the bacteria to die, but they do not destroy the cellular tissue structure of plants, so they are safe for crops, but have no killing effect on mites; Second, copper ions supplement the trace elements of crops, promote crop growth, stimulate bright colors of fruits and vegetables, improve quality, make them green and glossy, thereby attracting mites to inhabit, feed, and reproduce, stimulating mass egg-laying of mites; Third, although copper-based fungicides have no killing effect on mite pests, they do have a killing effect on their natural enemies, thus causing uncontrolled mite proliferation and rampant outbreaks, causing serious damage.
In view of this, when applying copper-based fungicides to control diseases, one must consider the point that they easily induce mite proliferation. In areas with frequent mite outbreaks or during dry seasons, attention should be paid to alternating use with other fungicides when applying copper-based fungicides, and do not use copper-based fungicides continuously multiple times.
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