Hello! Judging from the photo, the leaves appear to be the bottom leaves. It is a physiological disease. The main reasons: 1. Covering with mulch in the early stage, or the temperature inside the small shed is too high, which causes water loss after the air is released, which causes physiological leaf drying; 2. Long growth time and aging of the bottom leaves will also cause this phenomenon; 3. Fertilizing or spraying pesticides can also cause fertilizer damage and pesticide damage.