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Orange Coloration on Nepenthes truncata: Light-Induced Pigment vs. Fungal Rust Spot

Diagnostic Test

Wipe the orange area with a damp paper towel. If color transfers, it's likely fungal (rust/algae) – treat with sulfur/Neem. If color is integral to leaf, it's anthocyanin from high light – normal and desirable.

Light Response

N. truncata in bright light develops orange/red mottling. Your conditions (dappled sun, bright indirect, cool nights) are ideal for coloration.

Carnivorous Plants: Winter Lighting for Highland Nepenthes in Wisconsin: Shop Lights Over SAD Lamps; Diagnosing Leaf Browning in New Nepenthes: Acclimation, Lighting, and Species ID; Nepenthes truncata: Lowland Tag, But Grows Fine in Highland Conditions; Low-Light Nepenthes for Reptile Terrariums: N. ampullaria and N. ventricosa; Will Old Nepenthes Tendrils Develop Pitchers Later? Species-Dependent Timing; Nepenthes Ventricosa x Truncata: Troubleshooting Small, Curled New Leaves; Nepenthes truncata in Coconut Fiber: When to Switch Soils; Why Your Nepenthes Pitchers Are Blackening: Light Deficiency, Not Humidity; Red Leaves on Nepenthes: A Good Sign, and Pond Water Testing; Diagnosing Leaf Curl in Nepenthes 'Miranda' Under Fluorescent Light

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