In winter and spring, when the temperature inside the greenhouse drops below 20°C, humidity rises above 90%, and there's poor lighting, it creates an ideal environment for various plant diseases. Common issues include gray mold, powdery mildew, angular leaf spot, and downy mildew. These diseases often occur together, making control more challenging. To manage them effectively, it's essential to use pesticides wisely—by rotating or combining different products during spraying, which helps prevent resistance and improves disease control.
1. A combination of **pyrimethanil** and **difenoconazole**, or **pyrimethanil** with **fenhexamid**, is effective against gray mold, powdery mildew, and black spot.
2. **Dimethomorph** paired with **copper-based preparations**, or **dimethomorph** combined with **streptomycin (such as chlortetracycline or streptomycin sulfate)**, works well against downy mildew and bacterial leaf spots.
3. A mixture of **mepanipyrim** and **difenoconazole**, or **fluopicolide** with **myclobutanil**, is also effective for controlling downy mildew, powdery mildew, and black spot.
4. When symptoms appear, choose one of the above combinations based on the primary disease. The pesticide manufacturer recommends applying **ester-based formulations** every 3–5 days, then switching to another formula every 5–7 days. This alternating method should be used consistently. When no disease is present, spray every 7–10 days. If disease occurs, increase the frequency and alternate between prevention and treatment strategies.
The **Pesticide Information Network** reminds all growers that understanding how to use pesticides properly is key to preventing and managing plant diseases at their source. The formulas provided are for reference only. For more detailed guidance on pesticide application techniques, visit our website regularly for updated information and expert advice. Always follow label instructions and safety guidelines when handling agricultural chemicals.
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