Mandevilla Brown Spots Spreading Up from Bottom? Fungal—Spray Broad-Spectrum Fungicide, Avoid Wet Leaves at Dusk

Two mandevillas planted months ago. One died from bottom-up brown spots; second shows same. Planted in hard soil with potting soil layer. Full afternoon sun. Help?

Planting Was Fine—It's Fungal

Brown spots starting low and moving up = fungal leaf spot. Spores incubate on wet leaves overnight.

Treatment

• Spray Daconil or Funginex (broad-spectrum fungicide) on crown.
• Remove infected leaves.
• Water at base only—never wet foliage late afternoon.

Prevention

Morning watering lets leaves dry. Good air circulation helps. Fungicide stops spread; new growth stays clean.