1 Downy mildew harms leaves and petioles. Pay attention to drainage and ventilation; before and at the beginning of onset, spray with 50% TB 1000-fold or 65% zein-zinc 500-fold spray.
2 root rot often occurs in rainy seasons, causing the roots to rot and causing the death of the whole plant. Control method: spray 70% thiophanate-methyl WP 1000 times and remove the diseased plants.
3 cabbage butterfly, diamondback moth larvae damage the leaves. The larvae were sprayed with 90% trichlorfon 800 times or 2.5% rattan essential oil 500 to 800 times.
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