Diseases
Helianthus annuus L.
Tissue necrosis in sunflowers is a symptom of a wide range of pathologies, including infectious diseases and physiological stress caused by abiotic factors.
In the reference 4 varieties crop Sunflower, where this is mentioned in the description.
Tissue necrosis in sunflowers acts as a characteristic manifestation of pathogen impact: Phoma black stem (Phoma macdonaldii), which manifests as stem necrosis; Phomopsis stem canker (Diaporthe helianthi), which destroys the vascular system; bacterial blight (Xanthomonas arboricola); Sclerotinia wilt; Alternaria leaf spot; Septoria leaf spot; and charcoal rot. Infectious necrosis can affect leaves, stems, and flower heads, often leading to stem brittleness and premature plant maturation.
Physiological necrosis of sunflower bracts is a non-infectious disease that develops during temperature stress above +35°C combined with moisture deficit during the budding phase. In addition, local cell necrosis is part of the genetically determined hypersensitive response (HR) mechanism, which the plant uses to limit the spread of pathogens at the site of their penetration.
General information about the subject — on the page Tissue necrosis.
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION US
Helianthus annuus L. · Sunflower
Pioneer Overseas Corporation, USA
Helianthus annuus L. · Sunflower
Shein, Steve
Helianthus annuus L. · Sunflower
Institute of Field & Vegetable Crops (RS)