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 the rainy season, 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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