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Madagascar Palm (Pachypodium) Leaf Blackening: Mold/Mildew in Humidity

Owner Says No Insects

UK houseplant, new leaves black/sticky. Insects denied.

Likely: Mold/Mildew

High humidity + low airflow = fungal growth on tender new leaves.
Forum reports: hydrogen peroxide, cinnamon, dilute bleach tried.

Treatment Options

Improve airflow (fan).
Reduce humidity.
Fungicide (copper, sulfur) per local nursery advice.
Remove affected leaves promptly.

Arizona Limitation

Expert from dry climate – limited fungal experience. Local nursery best for UK-specific products.

Cactus: Madagascar Palm Trunk Collapse: Overwatering Suspected; Queen Palm Base Rot: Identifying Ganoderma Butt Rot and Exploring Options; Madagascar Palm (Pachypodium) Care: Light, Water, Cold Protection; Madagascar Palm Sun Sensitivity: Watering Correction for Crinkling Leaves; Are There Native Cacti in Madagascar?; Madagascar Palm Losing Leaves Indoors: Dormancy, Not Disease; Aloe dichotoma Root Rot: Smell/Pinch Test, Sulfur If Clean, Cutting If Rotted; Saving a Rotting Madagascar Palm (Pachypodium): Cutting, Callusing, and Rooting Protocol; Madagascar Palm (Pachypodium lamerei): Growing This Striking Succulent Tree Indoors; Palm Disease Guide: Nutritional, Environmental, and Fungal Disorders

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