Diseases
Helianthus annuus L.
A fungal disease of sunflower caused by a complex of imperfect fungi of the genus Alternaria, characterized by the infection of all above-ground plant organs throughout the growing season.
In the reference 61 varieties crop Sunflower, where this is mentioned in the description.
The primary pathogen of the disease is the specialized species Alternaria helianthi, although the pathogenic complex also includes the species Alternaria alternata, A. tenuissima, A. helianthiinficiens, A. zinniae, A. arborescens, and species of the A. infectoria group. The disease manifests on cotyledons as round yellow spots, on leaves as spotting with a yellow halo leading to necrosis, and on stems and flower heads in the form of dark streaks and spots, which disrupt seed nutrition.
In humid conditions, a characteristic olive-velvety bloom of fungal sporulation develops on the affected areas. Specific monogenic loci for resistance to the pathogen have not been identified in the crop; therefore, breeding for immunity is based primarily on interspecific hybridization methods with wild Helianthus species to achieve field resistance.
General information about the subject — on the page Alternaria blight.
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
Pacific Seeds Pty Ltd
Helianthus annuus L. · Sunflower
Pannar (Pty) Ltd
Helianthus annuus L. · Sunflower
Tierry Andre
Helianthus annuus L. · Sunflower
Ragt 2n, F
Helianthus annuus L. · Sunflower
LIDEA FRANCE SAS
Helianthus annuus L. · Sunflower
Euralis Semences, F
Helianthus annuus L. · Sunflower
Euralis Semences
Helianthus annuus L. · Sunflower
Asgrow France SA (FR)
Helianthus annuus L. · Sunflower
Euralis Semences, F
Helianthus annuus L. · Sunflower
Euralis Semences, Mondonville FR
Helianthus annuus L. · Sunflower
MAY-AGRO SEED CORPORATION
Helianthus annuus L. · Sunflower
Syngenta Participations AG c/o Syngenta International AG
Helianthus annuus L. · Sunflower
Euralis Semences FR
Helianthus annuus L. · Sunflower
Sadik El Sayed
Helianthus annuus L. · Sunflower
Olivier Soulie
Helianthus annuus L. · Sunflower
May Agro Seed Corporation (TR)
Helianthus annuus L. · Sunflower
MAY AGRO SEED COPR.
Helianthus annuus L. · Sunflower
LIDEA FRANCE SAS
Helianthus annuus L. · Sunflower
Quality Crops Agro, RO
Helianthus annuus L. · Sunflower
Jean Pierre Dufourcq
Helianthus annuus L. · Sunflower
Olivier Soulie
Helianthus annuus L. · Sunflower
Euralis Semences
Helianthus annuus L. · Sunflower
Olivier Soulie
Helianthus annuus L. · Sunflower
Euralis Semences, Mondonville FR