Dieffenbachia Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Dieffenbachia diseases.
Dieffenbachia Diseases - Articles
Dieffenbachia Diseases
DiseaseSympomsPathogen/CauseManagement
AnthracnoseCircular to oval brown leaf spots have a yellow halo. Spots may become two inches in diameter and contain tiny black fungal fruiting structures.Colletrotrichum gloeosporioidesAvoid overhead watering.Apply a fungicide to protect healthy plants.
Bacterial Leaf SpotSmall gray or dark green leaf spots enlarge and become irregularly shaped, tan, dark brown, or black.Erwinia carotovora or Erwinia chrysanthemiPurchase plants free of the disease. Remove infected leaves and water in a manner that keeps the surface of the leaves dry.
WiltLower leaves yellow, wilt, and die.DroughtMaintain even soil moisture.
Marginal Leaf BurnMargins of leaves brown and die.Over-fertilizationDo no over-fertilize. If no slow-release fertilizer is present, leach the potting medium.
Myrothecium Leaf SpotLarge gray-brown, oval leaf spots form at leaf tips or margins. Fungal fruiting structures form in concentric rings within the spots on the underside of the leaf.Myrothecium roridumDo not apply excessive amounts of nitrogen fertilizer. Apply a fungicide to protect healthy plants.
Nitrogen DeficiencyPlants are yellowed with smaller than normal leaves and short internodes.Lack of fertilization.Apply a balanced fertilizer solution.
VirusLeaves have a mosaic of light green where they should be dark green. Plants may be stunted, and leaves deformed. Some cultivars die within a month of infection.Dasheen mosaic virusDiscard infected plants. Maintain good aphid control. Disinfests tools used on the plants.

Prepared by Gary W. Moorman, Professor of Plant Pathology