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Diseases

Phoma black stem of sunflower

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.

Sources8

Varieties of Sunflower mentioned in the description

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.

LG50497

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN EUROPE S.A.

IT
3 records

86B

Terminated

Helianthus annuus L. · Sunflower

Monsanto Technology LLC, US

FR
3 records

RGT Llucy

Terminated

Helianthus annuus L. · Sunflower

RAGT 2n, FR

FR
3 records

RGT Rivollia

Active

Helianthus annuus L. · Sunflower

RAGT 2n, FR

FR
3 records

Paraíso

Active

Helianthus annuus L. · Sunflower

STRUBE ESPAÑA, S.A.

ES
4 records

Lucas

Terminated

Helianthus annuus L. · Sunflower

Syngenta Crop Protection AG

IT
3 records

LG50741 CLP

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN EUROPE S.A.

IT
3 records

LG50777

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN EUROPE S.A.

IT
3 records

LG58634

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN EUROPE S.A.

IT
3 records

Jalon

Active

Helianthus annuus L. · Sunflower

EURALIS SEMILLAS, S.A.

ES
3 records

Hysun 310 SU

Active

Helianthus annuus L. · Sunflower

Neno Nenov

UA
4 records

Griffon

Active

Helianthus annuus L. · Sunflower

CST(CLUB SELECT.TOURNESOL

ES
4 records

Graal

Active

Helianthus annuus L. · Sunflower

LABOULET SEMENCES

IT
4 records

FD21CL77

Active

Helianthus annuus L. · Sunflower

JOITA-PACUREANU MARIASTANCIU DANILSTANCIU MARIAANTON FLORIN GABRIEL

RO
4 records

FD21E45

Active

Helianthus annuus L. · Sunflower

JOITA-PACUREANU MARIASTANCIU DANILSTANCIU MARIAANTON FLORIN GABRIEL

RO
4 records

Elsasun IR

Active

Helianthus annuus L. · Sunflower

Elena Andreea Teodorescu

UA
4 records

Diego

Terminated

Helianthus annuus L. · Sunflower

VERNEUIL RECHERCHE

IT
3 records

Dalena CLP

Terminated

Helianthus annuus L. · Sunflower

prof.Nina Nenova,prof.Galin Georgiev, prof.Valentina Encheva

BG
4 records

BG N 4

Active

Helianthus annuus L. · Sunflower

Cvejic Sandra, Jocic Sinisa,

UA
5 records

Avalon

Active

Helianthus annuus L. · Sunflower

PARIJ YaROSLAV FEDOROVICh / PARIJ MIROSLAV FEDOROVICh / ZOLOTAREV KONSTANTIN MITROFANOVICh / YaKOVENKO ANATOLIJ ALEKSANDROVICh

UA
4 records

MAS 835OL

Active

Helianthus annuus L. · Sunflower

MAS Seeds,FR

FR IT
3 records

LID2067H

Active

Helianthus annuus L. · Sunflower

Lidea France SAS, FR

BG SK
3 records

Duncan CLP

Active

Helianthus annuus L. · Sunflower

Syngenta Crop Protection AG, CH

FR UA
5 records

LG50652

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN EUROPE S.A.

IT
3 records

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