Diseases
Helianthus annuus L.
A fungal disease of sunflower caused by Phoma macdonaldii (Leptosphaeria lindquistii), affecting all vegetative organs and flower heads. It is characterized by the appearance of necrotic spots, which on stems take on a distinctive blue-black color with a metallic sheen.
In the reference 479 varieties crop Sunflower, where this is mentioned in the description.
The pathogen of the disease is the fungus Phoma macdonaldii, which also has an ascomycete stage of development, Leptosphaeria lindquistii. Symptoms appear on leaves at the 3–4 pair of true leaves stage as brown spots with a yellow margin, which spread to the stem through the petioles. At the points of petiole attachment, large dark brown or blue-black necroses occur, which can girdle the stem and lead to a loss of tissue integrity.
Infection of the flower heads manifests as the appearance of brown spots on their dorsal side, which leads to the formation of shriveled seeds or their complete underdevelopment. In sunflower breeding, there are no lines with complete genetic resistance to the pathogen, so work is carried out exclusively in the direction of selecting tolerant hybrids based on the evaluation of their phenotypic response under conditions of natural or artificial inoculation.
General information about the subject — on the page Phoma rot.
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
LIDEA FRANCE SAS
Helianthus annuus L. · Sunflower
RAGT 2N S.A.S
Helianthus annuus L. · Sunflower
RAGT 2N S.A.S
Helianthus annuus L. · Sunflower
SYNGENTA FRANCE S.A.S.
Helianthus annuus L. · Sunflower
Syngenta Participations AG., Basel CH
Helianthus annuus L. · Sunflower
Laboulet Semences, FR
Helianthus annuus L. · Sunflower
Verneuil Recherche (FR)
Helianthus annuus L. · Sunflower
KWS SAAT SE&CO.KGaA, DE
Helianthus annuus L. · Sunflower
UPL FRANCE
Helianthus annuus L. · Sunflower
UPL FRANCE
Helianthus annuus L. · Sunflower
Euralis Semences, Mondonville FR
Helianthus annuus L. · Sunflower
Euralis Semences FR
Helianthus annuus L. · Sunflower
Limagrain Europe SA (FR)
Helianthus annuus L. · Sunflower
Pierre GARRAUD
Helianthus annuus L. · Sunflower
KWS SAAT SE & CO.KGAA
Helianthus annuus L. · Sunflower
Ragt 2n, F
Helianthus annuus L. · Sunflower
LABOULET SEMENCES
Helianthus annuus L. · Sunflower
Pablo Bergada
Helianthus annuus L. · Sunflower
Saaten Union Romania, RO
Helianthus annuus L. · Sunflower
SYNGENTA FRANCE S.A.S.
Helianthus annuus L. · Sunflower
SYNGENTA SEEDS A.G.
Helianthus annuus L. · Sunflower
Ragt 2n, F
Helianthus annuus L. · Sunflower
Sadik
Helianthus annuus L. · Sunflower
Sadik El Sayed