Rice seedlings in paddy fields should be treated based on the severity of the disease. If the infection is widespread and there are clusters of dead or dying seedlings, it's important to take immediate action with **pesticides**. However, if the disease is mild and only shows scattered symptoms, you can use a 500-fold dilution of tricyclic azole as a preventive measure. Apply this solution 2–3 days before transplanting, or dip the seedlings in the solution for 30 minutes before planting. This helps prevent leaf blast from occurring later in the field.
Here are some effective methods:
1. **Tricyclazole (20% wettable powder):** Use 75–100 grams per acre mixed with 40–50 kg of water. Spray the plants two days before transplanting, or dip the seedlings during the early growth stage. This helps protect against leaf blast.
2. **Fuji No. 1 (also known as Chu Yuling):** Mix 75–100 grams of 40% emulsion with 40–50 kg of water. Apply this in the early stages of leaf blast. If the disease persists, reapply after 10 days. After application, keep the field flooded with about 1 inch of water for 2–3 days to enhance effectiveness.
3. **Kexin San:** Combine 75 grams of 40% emulsion with 40 kg of water. Spray directly on infected leaves when acute lesions appear. Reapply after 7 days if the disease is severe.
4. **Carbendazim (50% WP):** Use 0.5 grams per acre mixed with 40 kg of water. Spray when acute lesions are visible on the leaves. It’s effective for controlling fungal infections.
5. **Different Rice Glutinous Rice (40% emulsion):** Apply 40–125 grams per acre mixed with 50–75 kg of water at the early stage of leaf blast. This treatment not only controls leaf blast but also helps manage rice planthoppers and sheath blight.
For more detailed information on pesticide usage and best practices, visit the **China Pesticide Network**. Always follow safety guidelines when handling chemicals, and consider consulting local agricultural experts for tailored advice based on your specific conditions.
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