Pink Jasmine Leaf Blight in Wet Weather: Diagnosis & Rescue Plan

Fungal Leaf Blight: Cercospora & Alternaria

Constant rain on a balcony in San Jose (Zone 9b/10a) creates perfect conditions for jasmine leaf blight. Symptoms: curling, drying leaves spreading from bottom up; poor bud development.

Immediate Actions

1. Improve drainage – Ensure pot has holes; empty saucer promptly. Never let sit in water.
2. Maximize sun & air flow – Move to sunniest, breeziest spot possible.
3. Remove infected leaves – Prune off all brown/curled foliage; bag and trash (don't compost).
4. Continue fungicide – Apply copper-based or chlorothalonil fungicide per label, covering undersides. Repeat at 7–10 day intervals while wet weather persists.

If It's Too Far Gone

Severe infections may be unrecoverable. Take 4–6 inch semi-hardwood cuttings from any remaining healthy stems, root in perlite/peat under humidity, and start fresh plants. Discard the mother plant and soil.

Jasmine blight is manageable if caught early; relentless rain makes it tough. Prioritize dry foliage and airflow.