Cyclamen Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Cyclamen diseases.
Cyclamen Diseases - Articles


Bacterial Soft RotYellowing plants wilt and die rapidly. Corms have a wet, soft rot.Erwinia carotovora or Erwinia chrysanthemiPlant only healthy, sound corms. Discard infected plants. Plant in pasteurized media.
Botrytis BlightLeaf spots become tan in color. Flower petal spots are at first water-soaked but become tan. Infected crowns, petioles, and developing flowers are covered with gray fungal growth.Botrytis cinereaReduce the humidity in the greenhouse. Space plants to insure good air circulation. Apply a fungicide to protect healthy plants.
Fusarium WiltInfected plants become very yellow. Vascular tissue in the corm turns dark brown to black. Mature plants wilt and die.Fusarium oxysporum f. sp. cyclaminisPlant sound, disease-free corms in pasteurized media. Discard infected plants.
Leaf SpotYellow or brown or gray circular spots develop on leaves and may have a zonate pattern within them. Small dark brown dots can be seen within the spots.Septoria, Gloeosporium, or PhyllostictaWater plants in a manner that does not wet the leaves. Apply a fungicide to protect healthy plants.
Pythium Root RotYoung plants die. Stunting and root rot occurs on older plants.PythiumPlant in pasteurized media. Keep hose ends off the ground. Discard infected plants.
Thielaviopsis Root RotStunted plants have blackened roots.Thielaviopsis basicolaPlant in pasteurized media. Discard infected plants.
VirusesFlowers may be abnormal in shape. Leaves are deformed and streaked with yellow or brown markings or have ringspots in a thumb-print like pattern.Tobacco mosaic, cucumber mosaic, tobacco rattle, tomato aspermy, potato virus X, impatiens necrotic spotDiscard infected plants. Maintain good aphid and thrips control. Wash hands thoroughly and frequently when handling plants to prevent mechanical spread.

Fusarium wilt.


Impatiens necrotic spot virus symptoms on leaves and flowers (Photos by F. E. Gildow, Penn State)

Prepared by Gary W. Moorman, Professor of Plant Pathology