In winter and spring, when the temperature inside the greenhouse drops below 20°C, humidity remains above 90%, and factors like poor lighting accumulate over time, it often leads to several common plant diseases such as gray mold, powdery mildew, angular leaf spot, and downy mildew. These diseases tend to occur together, making management more challenging. To effectively control these issues, it's essential to use pesticides wisely by following the principles of rational mixing and alternating applications during spraying. This approach helps prevent the development of resistant pathogens and ensures better disease control.
1. A combination of **pyrimethanil** and **difenoconazole**, or **pyrimethanil** with **fenhexamid**, is effective against gray mold, powdery mildew, and black spot disease.
2. Mixing **dimethomorph** with **organic copper preparations**, or **dimethomorph** with **streptomycin (such as Chunremycin)**, works well for controlling downy mildew and bacterial leaf spots.
3. A mixture of **mandipropamid** and **difenoconazole**, or **emodic acid** combined with **myclobutanil**, is also effective against downy mildew, powdery mildew, and black spot disease.
4. When symptoms are already present, choose one of the above formulas based on the primary disease type. It is recommended by **pesticide manufacturers** to spray **ester-based formulations** every 3–5 days, followed by an alternate formula every 5–7 days. This rotation helps maintain effectiveness. In the absence of disease, a 7–10 day interval is sufficient for preventive spraying. If disease appears, increase the frequency and alternate between prevention and treatment methods.
The **Pesticide Information Network** reminds all growers that proper and scientific use of pesticides is key to addressing plant diseases at their source. The formulas provided here are for reference only. For more detailed information on pesticide application techniques and best practices, please visit the official website or consult local agricultural experts. Always read and follow the label instructions carefully before applying any pesticide.
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