Jasmine Fungal Leaf Spot: Neem Oil + Water Management

Diagnosis

Orange/red splotches on leaf backs → black spots on fronts → leaf drop = fungal leaf spot (likely Cercospora or Alternaria). Orange = sporulation; black = necrotic centers.

Variety Matters

Jasminum nitidum (lakeview) resists disease better than J. sambac or J. officinale.

Treatment

1. 100% pure neem oil: 1 tsp + 1 tsp mild soap/quart. Weekly × 3, then biweekly.
2. Water management: 1" per week deep soak. No overhead irrigation. Wet leaves = spore spread.
3. Sanitation: Remove fallen leaves promptly.
4. Mulch: 2–3" to reduce splash.

Why Neem

• Fungicide + miticide + insecticide.
• Non-toxic, preserves beneficials.
• Systemic-ish (absorbs into leaf).

Healthy, well-watered jasmine resists leaf spot. Stress (drought) is the underlying enabler.