Aglaonema Disease Management: Anthracnose, Bacterial Leaf Spot, and Nutritional Disorders

Managing Diseases and Disorders in Aglaonema Production

Aglaonema (Chinese evergreen) production faces fungal leaf spots, bacterial diseases, and nutritional disorders. The high humidity requirements for optimal growth create favorable conditions for foliar pathogens, requiring careful cultural management.

Anthracnose

Colletotrichum spp. cause circular to oval brown leaf spots with yellow halos, up to 2 inches diameter, with tiny black fungal fruiting structures.

Management: Avoid overhead watering.

Bacterial Leaf Spot

Pseudomonas cichorii, Erwinia chrysanthemi, or Xanthomonas campestris pv. dieffenbachiae cause small gray/dark green spots enlarging to irregular tan, dark brown, or black lesions.

Management: Purchase disease-free plants. Remove infected leaves. Water to keep leaf surfaces dry.

Copper Deficiency

New leaves yellow, strap-shaped, or distorted.

Management: Apply copper-containing micronutrient. Damaged leaves won't recover; new foliage will form normally.

Myrothecium Leaf Spot

Myrothecium roridum causes large gray-brown oval spots at leaf tips/margins with concentric rings of fruiting structures on undersides.

Management: Avoid excessive nitrogen fertilizer.

Integrated Aglaonema Health Practices

Successful Aglaonema production requires: disease-free starting material; sub-irrigation or careful watering to keep foliage dry; balanced fertilization (avoid excess nitrogen); regular scouting for leaf spots; immediate removal of infected leaves; copper supplementation if deficiency appears; and maintaining optimal humidity without condensation. The high humidity preference of Aglaonema makes foliar disease management a constant challenge requiring vigilant cultural practices.