Rice seedlings in paddy fields should be treated based on the severity of the disease. When the disease is widespread and there are clusters of dead seedlings, it's essential to apply pesticides immediately. However, if the infection is mild with only scattered lesions, you can take preventive measures. For example, use a 500-times diluted solution of tricyclazole as a grafting treatment 2-3 days before transplanting. Alternatively, dip the seedlings in a mixture of two liquid fungicides for 30 minutes. This helps prevent leaf blast once they are planted.
Here are some effective methods:
1. **Tricyclazole**: Use 20% tricyclazole wettable powder at a rate of 75–100 grams per acre, mixed with 40–50 kg of water. Apply this spray two days before transplanting, or dip the seedlings during the early growth stage. This helps protect against leaf blast effectively.
2. **Fuji No. 1 (also known as Chu Yuling)**: Mix 40% Fuji No. 1 emulsion at 75–100 grams per acre with 40–50 kg of water. Apply it during the early stages of leaf blast. If the disease persists, apply a second dose after 10 days. After application, keep the field flooded with 1 inch of water for 2–3 days to enhance effectiveness.
3. **Keben San**: Combine 75 grams of 40% Keben San emulsion with 40 kg of water. This is ideal for treating acute leaf lesions. If the disease is severe, reapply after 7 days for better control.
4. **Carbendazim**: Use 50% carbendazim WP at 0.5 grams per acre, mixed with 40 kg of water. Spray this when acute lesions appear on the leaves.
5. **Different Rice Glutinous Rice**: Apply 40–125 grams of 40% different rice glutinous rice emulsion per acre, mixed with 50–75 kg of water. This 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 region's conditions.
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