How to prevent and control anthracnose? A full breakdown of practical methods

Symptoms: When plants are planted too densely, ventilation is poor, water regulation is disrupted, or wounds are present, pathogens can easily invade and cause disease. In the early stages of infection, small brown sunken spots appear on the leaves, which later expand into round or irregular lesions; in severe cases, the center of the lesion becomes necrotic. This disease is most obvious on Cattleya (Cattleya orchids) and Phalaenopsis (moth orchids). Large-floweredCymbidium(Cymbidium hookerianum, East Asian orchid) when affected by this disease, the leaves form brown linear necrotic spots. On Dendrobium autumnale leaves, a distinct halo ring appears. Prevention and control methods: 1. Do not plant too densely; light, drainage, and ventilation need to be good. 2. Grow robust plants; avoid sunscald, cold damage, pesticide damage, and fertilizer burn. 3. Cut out the affected parts, and spray mancozeb 500x solution or captan 500-600x solution every 2 weeks as routine prevention. 4. For treatment, use 50% carbendazim wettable powder 500x solution or prochloraz 3000x solution, spraying once a week. Xue Congxian