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Primula Diseases

Name: Primula Diseases
SKU: ART-3388

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

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Updated:

April 3, 2023

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Disease	Symptoms	Pathogen/Cause	Management
Aster Yellows	Plants are stunted with excessive branching and yellow, strap-shaped leaves.	Phytoplasma	Destroy infected plants. Maintain good insect and weed control in the greenhouse.
Botrytis Blight	Leaves, especially those near the soil surface, rot and become covered with gray fungal growth as do fading flowers.	Botrytis cinerea	Heat and ventilate to maintain low humidity. Remove dead and dying tissue from the greenhouse. Apply a fungicide.
Damping-off	Seedlings wilt and die.	Pythium spp.	Plant in pasteurized potting mix. Discard infected plants. Apply a fungicide.
Phytophthora Root Rot	Roots rot and plants wilt and die.	Phytophthora primulae	Plant in pasteurized potting mix. Discard infected plants. Apply a fungicide to protect healthy plants.
Rhizoctonia Crown Rot and Bud Blight	Roots and stems brown. Plants wilt and die. Older plants may fail to flower or produce new leaves.	Rhizoctonia solani	Plant in pasteurized potting mix. Discard infected plants. Apply a fungicide to protect healthy plants.
Thielaviopsis Root Rot	Small black spots form on roots. Gradually, the entire root system browns. Old leaves die while younger leaves yellow.	Thielaviopsis basicola	Plant in pasteurized potting mix. Discard infected plants. Apply a fungicide to protect healthy plants.
Viruses	Leaves may be mottled, yellowed, or have dead spots or be curled. Plants are stunted. Flower color may break. Entire plants may die.	Tobacco necrosis, primrose mosaic, cucumber mosaic, impatiens necrotic spot, tomato bushy stunt, alfalfa mosaic, or tobacco ringspot.	Discard infected plants. Maintain good insect control, especially aphids and thrips.