What's eating my bulbophyllum falcatum?

Bulbophyllum falcatum, a compact African bulbophyllum orchid grown indoors or in a humid greenhouse, is most frequently attacked by spider mites when conditions become too warm and dry. Mealybugs are a secondary concern in the crevices between pseudobulbs. Scale can also establish on older stems. Consistent humidity and good airflow are essential preventive measures.

Pale stippling and fine webbing on undersides of small leaves; rapid spread in warm, dry conditions Raise humidity, spray with neem oil or insecticidal soap weekly; rinse foliage regularly

White cottony deposits wedged between pseudobulbs and at rhizome junctions; sticky residue Apply isopropyl alcohol with a fine-tipped swab; follow with diluted neem oil spray

Brown waxy bumps on pseudobulbs and rhizomes; plant growth slows and leaves yellow Scrape off with a soft brush dipped in soapy water; apply horticultural oil and repeat fortnightly