Cymbidium Leaf Spots & Tip Necrosis: Fungal Management

Small black spots (1–3 mm) on older foliage tips, plus black leaf tips. New growth clean. Plant 2–3 ft tall; pot seems small. Suspected root stress.

Diagnosis & Treatment

Common in cymbidiums and thin-leaved orchids. Caused by several fungi. Spray entire plant (both leaf sides) with copper-based fungicide—won't reverse existing damage but prevents spread to new growth. Repeat every 2–3 weeks during growing season. Expect copper salt buildup on leaves.

Follow-Up: Product & Fungi Details

• Product used: Kocide (copper hydroxide)—no phytotoxicity observed. Follow label.
• Fungi groups: Rust fungi or leaf-spot fungi. Broad-spectrum copper covers both.
• Alternatives (untested by expert): Captan, Zineb, Plantvax-75W.