Powdery mildew: mainly occurs when the temperature difference between day and night is large, and 8% carbendazim, 5% sulfur suspension, 43% tebuconazole (Youbuchengsheng), or diniconazole, or 25% hexaconazole (Baiyong), or 4% difenoconazole (Finals), or 1% flusilazole (rounding) can be used. It is best to add boron and calcium leaf fertilizer together, 5? Once every 7 days, spray twice in a row.