Cordyline (Ti Plant) Diseases
|Bacterial Leaf Spot and Stem Rot||Infected leaves and stems become wet and slimy. Cuttings rot. Roots of established plants turn black and die.||Erwinia chrysanthemi, E. carotovora pv. carotovora||Purchase plants free of the disease. Discard infected plants.|
|Fluoride Toxicity||Leaf tips and margins brown and die.||Excessive fluoride||Maintain a soil pH between 6.0 and 6.5. Do not use water containing more than 0.25 ppm fluoride. Do not use a potting mix with perlite or superphosphate fertilizer.|
|Fusarium Leaf Spot||Tan to red-brown, oval spots form on the tips of young leaves. Spots have a bright yellow halo.||Fusarium moniliforme||Avoid overhead watering. Apply a fungicide to protect healthy plants.|
|Fusarium Stem and Root Rot||Lower leaves yellow and wilt. Roots are brown. Tan spots form on the stem at the soil line and may b covered with powdery, yellowish spores.||Fusarium||Avoid overhead watering.Apply a fungicide to protect healthy plants. Discard infected plants.|
|Phyllosticta Leaf Spot||Small, round to irregular spots form on older leaves. Spots have purple borders and yellow halos.||Phyllosticta dracaenae||Avoid overhead watering. Apply a fungicide to protect healthy plants.|
|Phytophthora Leaf Spot||Leaves near the soil are water-soaked and have brown, irregular, zonate dead areas.||Phytophthora nicotianae||Plant in pasteurized mix. Discard infected plants. Apply a fungicide to protect healthy plants.|
|Poor Color||Plants appear dull, mostly dark purple to maroon and lack rose or pink tints.||Plants appear dull, mostly dark purple to maroon and lack rose or pink tints.||Maintain moderate fertilizer level. Shade in the summer but add light in the winter if too low. Maintain moderate temperatures.|
|Tip Death||Very young leaves die but the plant recovers.||Damage from fertilizer or leaf shining chemicals.||Keep fertilizer off the growing point and young leaves. Use leaf shining chemicals carefully.|
Prepared by Gary W. Moorman, Professor of Plant Pathology
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