After a watermelon crop has been affected by a locust infestation, it's crucial to assess the damage and take immediate action to help the plants recover. Even if most of the foliage is gone, as long as some leaves remain on a few plants and there are about 2 cm of root pods left, the crop can still be salvaged with proper care. While it's generally not advisable to replant, effective remedial measures must be taken to ensure good field management.
Here’s how to proceed:
1. **Prune the remaining vines** – Carefully trim any damaged vines, cutting just 0.5 cm beyond the wound to encourage new growth. For completely bare vines, cut them 2 cm above the ground to stimulate regrowth.
2. **Cover the roots with soil** – Due to the storm or hail, the roots may have been exposed. Gently mound moist, fine soil around the base of the plants. Make sure to re-cover any mulch film and press it down firmly to retain heat and moisture while controlling weeds.
3. **Apply timely fertilization** – After the disaster, composting can greatly aid recovery. Apply 5–7 kg of ammonium nitrate per acre, or 2–4 kg of urea (preferably compound fertilizer). Spread it in holes 5 cm away from the roots, at a depth of about 8 cm. Additionally, apply a root drench with 0.2–0.3% potassium dihydrogen phosphate solution, or a foliar spray of 1.4% Harvester 6000 times, or 1.8% Love More (also known as sodium nitrophenol) diluted 5000 times for best results.
4. **Loosen the soil lightly** – After a locust attack, the soil can become compacted, reducing warmth and airflow. Gently loosen the soil between rows to improve root development and increase temperature, but be careful not to damage the roots.
5. **Control pests and diseases** – Combine this with pruning, and spray the plants every 5–7 days with Topbujin diluted 800–1000 times. Repeat 2–3 times to prevent disease spread. If locusts are still present, use 40% dimethoate EC diluted 1500 times to kill them promptly.
By following these steps, you can significantly improve the chances of your watermelon crop recovering and producing a healthy harvest. Regular monitoring and timely intervention are key to success.
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