Why do orchid flower buds have black spots and turn yellow?

Agricultural technician's answer: anthracnose; choose difenoconazole-propiconazole or flusilazole for control.

Agricultural technician's answer: for anthracnose, use difenoconazole-bromothalonil, difenoconazole-propiconazole, or trifloxystrobin-tebuconazole for control.

Agricultural technician's answer: for anthracnose, you can choose difenoconazole, prochloraz, Luna Sensation, Kennda, etc. for spray control

Agricultural technician's answer: for anthracnose damage, it is recommended to use trifloxystrobin-tebuconazole, flusilazole, or difenoconazole-propiconazole for control

Agricultural technician's answer: for anthracnose damage, use difenoconazole-bromothalonil for spray control.

Agricultural technician's answer: consider anthracnose; use prochloraz, tebuconazole-azoxystrobin