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Diseases

Rhizopus Head Rot of Sunflower

Helianthus annuus L.

A disease of sunflower heads caused by fungi of the genus Rhizopus, characterized by rapid moisture loss and mummification of tissues, with felt-like mycelium forming between the seeds.

In the reference 55 varieties crop Sunflower, where this is mentioned in the description.

The pathogens of the disease are fungi of the order Mucorales, primarily the species Rhizopus stolonifer, Rhizopus nodosus, Rhizopus oryzae, and Rhizopus arrhizus. The disease manifests during the head maturation period, starting with the appearance of brown, decaying spots on the back side, which spread rapidly.

Distinctive signs of the infection include rapid moisture loss leading to hardening and mummification of tissues, as well as the development of gray or dirty-white felt-like mycelium between the seeds on the front side of the head. Affected seeds become shriveled, acquire a bitter taste, and are prone to shattering.

Pathogen development is favored by high temperatures in the range of 30–35 °C combined with low air humidity. The pathogens have a wide host range and do not exhibit narrow race specificity; currently, there are no recognized specific resistance genes to this disease.

General information about the subject — on the page Dry 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.

LG50529 SX

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG FR IT SK UA
8 records

LG50450

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG ES IT UA
8 records

LG58390

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG ES UA
8 records

LG58630

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG SK UA
9 records

Reasun

Active

Helianthus annuus L. · Sunflower

TEODORESCU ANDREEA

IT RO UA
9 records

Megasun

Active

Helianthus annuus L. · Sunflower

VANDERHAVE RESEARCH

BG ES
8 records

LG50625

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

IT SK UA
6 records

LG50449 SX

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG IT UA
6 records

LG50609 SX

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

SK UA
5 records

LS Magistral

Active

Helianthus annuus L. · Sunflower

LABOULET SEMENCES

IT UA
5 records

LG50616

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

IT UA
5 records

LG50485

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN EUROPE S.A.

BG IT
4 records

LG50487 CLP

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN EUROPE S.A.

IT UA
5 records

LG 56.65

Active

Helianthus annuus L. · Sunflower

Limagrain Europe, Saint Beauzire (FR)

HR
2 records

LG50302

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

Kh 720 V

Active

Helianthus annuus L. · Sunflower

Brahin Oleksandr Mykolaiovych, Popova Ol`ha Andriivna, Kryvosheieva Olena Vatslavivna, Veselyi Vitalii Oleksandrovych, Kuzmyshena Nadiia Viktorivna, Syvenko Valentyna Ivanivna, Makliak Kateryna Mykolaivna, Alad`ina Zoia Kyrylivna, Kyrychenko Viktor Vasyl`

UA
5 records

LG50633

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN EUROPE S.A.

IT
2 records

DS11-15SU

Active

Helianthus annuus L. · Sunflower

TEODORESCU ANDREEA

UA
3 records

LG5597 CLP

Active

Helianthus annuus L. · Sunflower

SK
3 records

LG5639

Protection expired

Helianthus annuus L. · Sunflower

SK
2 records

RP 521

Terminated

Helianthus annuus L. · Sunflower

RHONE POULENC AGROCHIMIE (FR)

FR
1 record

Pervistok

Terminated

Helianthus annuus L. · Sunflower

Levchenko Valentyna Ivanivna, Shuhurova Nataliia Oleksiivna, Odynets` Serhii Ivanovych, Sereda Valentyna Oleksiivna, Shudria Larysa Ivanivna, Kutischeva Nataliia Mykolaivna,

UA
2 records