Cordyline (Ti Plant) Disease Guide: Fungal, Bacterial, and Physiological Disorders

Managing Diseases and Disorders in Cordyline Production

Cordyline (Ti plant) faces a diverse array of problems including fungal leaf spots and rots, bacterial diseases, viral infections, and physiological disorders related to fluoride toxicity and nutritional issues. Understanding these issues is essential for producing high-quality foliage plants.

Bacterial Leaf Spot and Stem Rot

Erwinia chrysanthemi and E. carotovora pv. carotovora cause wet, slimy leaves and stems, cutting rot, and blackening/death of established plant roots.

Management: Purchase disease-free plants. Discard infected plants immediately.

Fluoride Toxicity

Leaf tips and margins brown and die from excessive fluoride.

Management: Maintain soil pH 6.0-6.5. Avoid water with >0.25 ppm fluoride. Do not use perlite or superphosphate fertilizer in potting mix.

Fusarium Leaf Spot

Fusarium moniliforme creates tan to red-brown oval spots on young leaf tips with bright yellow halos.

Management: Avoid overhead watering. Apply protective fungicides.

Fusarium Stem and Root Rot

Fusarium spp. cause lower leaf yellowing/wilting, brown roots, and tan soil-line stem spots with powdery yellowish spores.

Management: Avoid overhead watering. Apply fungicides. Discard infected plants.

Phyllosticta Leaf Spot

Phyllosticta dracaenae forms small round to irregular spots on older leaves with purple borders and yellow halos.

Management: Avoid overhead watering. Apply protective fungicides.

Phytophthora Leaf Spot

Phytophthora nicotianae causes water-soaked leaves with brown, irregular, zonate dead areas near soil.

Management: Plant in pasteurized mix. Discard infected plants. Apply fungicides.

Physiological Disorders

Poor Color

Plants appear dull, dark purple/maroon lacking rose/pink tints.

Management: Maintain moderate fertilizer. Shade in summer, add light in winter. Maintain moderate temperatures.

Tip Death

Very young leaves die but plant recovers. Caused by fertilizer or leaf-shine chemical damage.

Management: Keep fertilizer off growing points and young leaves. Use leaf-shine chemicals carefully.

Integrated Production Practices

Successful Cordyline production requires: fluoride-free inputs (water, media, fertilizers); pasteurized growing media; avoidance of overhead irrigation; regular fungicide protection for fungal leaf spots; careful fertilizer placement; appropriate light/temperature management; and immediate removal of bacterially infected plants. These practices ensure vibrant, healthy foliage color and minimize losses.