leaf spot on Dieffenbachia
Quick answer
If your Dieffenbachia has leaf spot, the most likely cause is: Fungal leaf spot on Dieffenbachia develops when leaves stay in an environment that is too warm, too humid, or poorly ventilated, allowing fungal pathogens to establish on the foliage. The disease shows up as soft brown spots on leaves and is reported as common on dieffenbachia and dracaena, frequently appearing in low-light crowded plantings where air circulation is reduced.
Start here:
- 1. Prune out affected leaves and dispose of them to remove the fungal source and prevent further spread to healthy foliage
- 2. Apply sulfur spray or powder—an organic fungicide—following package instructions exactly, treating both leaf surfaces and surrounding air
Why Dieffenbachia gets leaf spot
Dieffenbachia seguine
Fungal leaf spot on Dieffenbachia develops when leaves stay in an environment that is too warm, too humid, or poorly ventilated, allowing fungal pathogens to establish on the foliage. The disease shows up as soft brown spots on leaves and is reported as common on dieffenbachia and dracaena, frequently appearing in low-light crowded plantings where air circulation is reduced.
How to reverse leaf spot on Dieffenbachia
- 1
Prune out affected leaves and dispose of them to remove the fungal source and prevent further spread to healthy foliage
- 2
Apply sulfur spray or powder—an organic fungicide—following package instructions exactly, treating both leaf surfaces and surrounding air
- 3
Remove shading foliage and increase air circulation around the plant to reduce the stagnant-humidity conditions that favor leaf spot
Keep leaf spot off this Dieffenbachia
Provide adequate ventilation around dieffenbachia foliage, keep humidity moderate rather than stagnant, avoid low-light crowded plantings, and inspect leaves regularly to catch early spots before they spread.