Carnation (Dianthus) Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Carnation (Dianthus) diseases.
Carnation (Dianthus) Diseases - Articles
Carnation (Dianthus) Diseases
DiseaseSymptomsPathogen/CauseManagement
Alternaria Leaf SpotSmall purplish spots form on leaves. Their centers become brown while the leaf yellows.Alternaria dianthicola or Alternaria dianthiApply a fungicide to protect healthy plants.
Bacterial Slow Wilt or StuntWilting, twisting, curling and stunting of lower leaves and side shoots followed by death of lower leaves. Wilted plants may recover only to wilt again. Stunted plants have narrow, yellow-green leaves. Symptoms require several weeks to develop.Erwinia chrysanthemiGrow in raised beds pasteurized between crops. Use culture indexed cuttings free of the pathogen. Destroy infected plants.
Bacterial WiltLeaves turn gray-green then yellow and die. Roots rot. Vascular tissue browns.Cracks develop in internode tissue. Slime oozes from these cracks when humidity is high.Pseudomonas caryophylliPot and propagate in pasteurized raised beds. Use clean, disinfested tools. Use culture-indexed cuttings free of the pathogen. Destroy infected plants.
Botrytis BlightPetals turn brown and are covered with gray, fungal growth.Botrytis cinereaSpace plants to insure good air circulation. Maintain low humidity. Avoid watering late in the day. Remove crop debris. Apply a fungicide to protect healthy plants.
Fusarium WiltLower leaves yellow and wilt up one side of plant. Symptoms progress up plant. Top of main shoot grows at right angle to main stem. Late in the disease, root and stems rot.Fusarium oxysporumPot and propagate in pasteurized raised benches. Use culture indexed plants free of the pathogen.
Fusarium Stem RotReddish-brown spots at the base. No vascular discoloration occurs beyond the rotted area.Fusarium graminearum, F. avenaceum, or F. culmorumPlant only healthy, pathogen-free cuttings in pasteurized, raised beds.
Greasy BlotchSmall, web-like patterns give leaves a greasy appearance. Leaves yellow and die.Zygophiala jamaicensisMaintain relative humidity below 85%.
Phialophora WiltPlants wilt, leaves yellow, and vascular tissue is discolored dark brown.Phialophora cinerescensSee Fusarium wilt above.
Rhizoctonia Stem RotStems at the soil level have a lesion with a brown border. Stems have dry shredded appearance.Rhizoctonia solaniPlant in pasteurized, raised beds. Apply a soil drench to protect healthy plants.
RustSmall blisters containing rust-red spores form on leaves.Uromyces dianthiApply a fungicide to protect healthy plants.
VirusesLeaves may be mottled, have yellow spotting, dead flecks, line or ring spot patterns. Plant may be distorted or have flower color breaking.15 different viruses are known.Plant virus-indexed cuttings. Maintain good insect and mite control. Destroy infected plants.


Alternaria leaf spot.


Rust.

Authors

Gary W. Moorman, Ph.D.