What fungicides are there for orchids? A comprehensive summary of common types

5% myclobutanil emulsifiable concentrate, high-efficiency, low-toxicity, broad-spectrum, long-lasting, safe, spray once every two weeks, 1500-2000 times dilution. 75% chlorothalonil wettable powder, 600-800 times dilution, spray once every ten days. Triadimefon, also known as triadimefon, mixed with zineb, 600-800 times dilution, spray once every ten days. The above chemicals are effective for treatingorchidsanthracnose, leaf spot, fusarium wilt, powdery mildew, southern blight, etc. 25% Bingdukesha Wang, 5% Junduqing aqueous solution, not only can inhibit and kill the above-mentioned pathogens, but also has efficacy against certain viruses, such as mosaic virus, viral diseases, etc., spray at 400-600 times dilution, once every seven to ten days. Penicillin, streptomycin, and virus spirit injections mixed together, has both bactericidal effect and the effect of inhibiting and killing viruses, each bottle of injection diluted at 2000 times water for spraying, spray once every five days. All the above chemicals must be sprayed three times consecutively as one treatment course. Regardless of which chemical is used, in summer and autumn when temperatures are high, choose to spray on sunny mornings or evenings, avoiding spraying during the high temperatures at noon, so as to prevent the chemicals from damaging the leaves. In winter and spring, choose to spray at noon on sunny days when the temperature is relatively high. The chemicals can effectively penetrate into the bodies of insects, pathogens, and viruses, and are easily absorbed by orchid leaves, effectively achieving the purpose of prevention and control. When applying chemicals, it should be done when the potting soil is relatively dry; if the potting soil is too wet, the efficacy is poor, and avoid applying chemicals on rainy days. (Chen Jisheng)