What is the disease of the black spot on the leaves of this orchid?

The agricultural technician replied: anthrax is harmful. It is suggested that difenoconazole, bromofenitrile, prochloraz and pyrimethoxim should be sprayed to control the disease.

Agricultural technician replied: anthrax hazard is recommended to use oxime tebuconazole or flusilazole or benzopropiconazole for prevention and control.

Agricultural technician replied: anthrax with benzylbromopronitrile, benzopropiconazole, flusilazole and other prevention and treatment.

The agricultural technician replied: caused by anthrax, spray with difenoconazole or tebuconazole!

Agricultural technician replied: anthrax, choose tebuconazole or flusilazole for prevention and treatment.