Gerbera daisies face numerous fungal diseases affecting foliage, stems, crowns, and roots, plus viral infections. The dense rosette growth habit creates favorable microclimates for many pathogens, requiring vigilant management.
Alternaria spp. cause brown specks on florets and leaves with white centers on leaf spots.
Management: Maintain low humidity. Avoid wetting leaves when watering. Apply protective fungicides.
Botrytis cinerea causes long brown petiole spots, leaf yellowing/death, tan petal spots, stem death at soil line, and gray fungal growth.
Management: Space for air circulation. Maintain low humidity. Avoid late-day watering. Remove crop debris. Apply fungicides.
Fusarium solani blackens petiole bases causing plant collapse.
Management: Plant in pasteurized media. Discard infected plants.
Phytophthora cryptogea causes sudden wilting, leaf browning, root rot, and crown rot.
Management: Plant in pasteurized media. Avoid overhead watering. Apply fungicides.
Golovinomyces cichoracearum (formerly Erysiphe) produces white fungal growth on leaf surfaces.
Management: Apply protective fungicides.
Pythium spp. cause wilting and death from root rot.
Management: Plant in pasteurized media. Apply fungicides.
Rhizoctonia solani causes brown soil-line stem lesions with wilting and death.
Management: Plant in pasteurized media. Apply fungicides.
Thielaviopsis basicola causes yellowing, wilting, death with dark brown to black roots.
Management: Plant in pasteurized media. Apply fungicides.
Pseudomonas cichorii causes small to large circular spots becoming irregular dark brown/black, sometimes with concentric rings.
Management: Maintain low humidity. Avoid overhead watering.
Tobacco rattle, gerbera mosaic, impatiens necrotic spot, and cucumber mosaic viruses cause mottling, yellow spotting, dead flecks, line/ring spots, distortion, and flower color breaking.
Management: Maintain insect/mite control. Plant in pasteurized media. Destroy infected plants.
Successful Gerbera production requires: pasteurized media for all soil-borne pathogens; low humidity and dry foliage (sub-irrigation preferred); wide spacing for air circulation; regular scouting for early detection; preventive fungicide program targeting Botrytis, powdery mildew, and crown/root rots; strict insect vector control for viruses; and immediate removal of infected plants. The rosette habit traps humidity, making environmental management critical.
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