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Gerbera Diseases

Name: Gerbera Diseases
SKU: ART-3533

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

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Updated:

July 5, 2023

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Disease	Symptoms	Pathogen/Cause	Management
Alternaria Leaf Spot	Brown specks form on florets and the leaves. Centers become white on the leaf spots.	Alternaria	Maintain low relative humidity and do not wet leaves when watering. Apply a fungicide to protect plants.
Bacterial Leaf Spot	Small to large spots are circular at first, then become irregular and dark brown to black. May have a concentric ring pattern.	Pseudomonas cichorii	Maintain low relative humidity. Avoid overhead watering.
Botrytis Blight	Petioles 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 cinerea	Space 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 Rot	Petiole of leaves blacken at the base as the plant collapses.	Fusarium solani	Plant in pasteurized potting media. Discard infected plants.
Phytophthora Crown Rot	Plants wilt suddenly. Leaves brown. Roots are rotted and a crown rot develops.	Phytophthora cryptogea	Plant in pasteurized potting media. Avoid overhead watering. Apply a fungicide to protect plants.
Powdery Mildew	White fungal growth develops on the surface of leaves.	Golovinomyces cichoracearum (formerly Erysiphe)	Apply a fungicide to protect plants.
Pythium Root Rot	Plants wilt and die as roots rot.	Pythium	Plant in pasteurized potting media.Apply a fungicide to protect plants.
Rhizoctonia Crown Rot	Stems at the soil level have a brown lesion. Plants wilt and die.	Rhizoctonia solani	Plant in pasteurized media. Apply a fungicide to protect plants.
Thielaviopsis Root Rot	Plants yellow, wilt, and die. Roots are dark brown to black.	Thielaviopsis basicola	Plant in pasteurized media. Apply a fungicide to protect plants.
Viruses	Leaves 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