Gerbera Diseases

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


Alternaria Leaf SpotBrown specks form on florets and the leaves. Centers become white on the leaf spots.AlternariaMaintain low relative humidity and do not wet leaves when watering. Apply a fungicide to protect plants.
Bacterial Leaf SpotSmall to large spots are circular at first, then become irregular and dark brown to black. May have a concentric ring pattern.Pseudomonas cichoriiMaintain low relative humidity. Avoid overhead watering.
Botrytis BlightPetioles have long brown spots. Leaves yellow and die. Petals have tan spots. Stems at soil level are killed. Infected tissues become 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 plants.
Fusarium Stem RotPetiole of leaves blacken at the base as the plant collapses.Fusarium solaniPlant in pasteurized potting media. Discard infected plants.
Phytophthora Crown RotPlants wilt suddenly. Leaves brown. Roots are rotted and a crown rot develops.Phytophthora cryptogeaPlant in pasteurized potting media. Avoid overhead watering. Apply a fungicide to protect plants.
Powdery MildewWhite fungal growth develops on the surface of leaves.Golovinomyces cichoracearum (formerly Erysiphe)Apply a fungicide to protect plants.
Pythium Root RotPlants wilt and die as roots rot.PythiumPlant in pasteurized potting media.Apply a fungicide to protect plants.
Rhizoctonia Crown RotStems at the soil level have a brown lesion. Plants wilt and die.Rhizoctonia solaniPlant in pasteurized media. Apply a fungicide to protect plants.
Thielaviopsis Root RotPlants yellow, wilt, and die. Roots are dark brown to black.Thielaviopsis basicolaPlant in pasteurized media. Apply a fungicide to protect plants.
VirusesLeaves may be mottled, have yellow spotting, dead flecks, line or ring spot patterns. Plants may be distorted or have flower color breaking.Tobacco rattle, gerbera mosaic, impatiens necrotic spot, and cucumber mosaic viruses.Maintain good insect and mite control. Plant in pasteurized media. Destroy infected plants

Fusarium crown rot.

Prepared by Gary W. Moorman, Professor of Plant Pathology