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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.

LG 56.65 M

Active

Helianthus annuus L. · Sunflower

Tuson Jean-Mark

BG FR HR IT RO SK +1
18 records

LG 5485

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG ES FR IT SK UA
15 records

LG 5633 CL

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

AT BG CZ RO SK UA
13 records

LG 5542 CL

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG ES IT RO UA
16 records

LG 55.80

Active

Helianthus annuus L. · Sunflower

Limagrain Verneuil Holding (FR)

BG IT SK UA
13 records

LG50479 SX

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG IT RO SK UA
14 records

LG 5550

Active

Helianthus annuus L. · Sunflower

Limagrain-Advanta Nederland B.V.

BG ES RO UA
11 records

LG 5543 CL

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN VERNEUIL HOLDING S.A.

BG IT SK UA
12 records

LG 50585

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG IT SK UA
11 records

LG 5555 CLP

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG IT RO UA
12 records

LG 50635 CLP

Active

Helianthus annuus L. · Sunflower

Remy Rouane

BG IT UA
11 records

LG 5662

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

FR IT SK UA
10 records

LG 50662

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

HU IT SK UA
11 records

LG 56.63 CL

Active

Helianthus annuus L. · Sunflower

Limagrain Europe, F

RO SK UA
11 records

P 64LP140

Active

Helianthus annuus L. · Sunflower

Sadik El Sayed

ES RO UA
12 records

LG 50510

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

IT SK UA
10 records

LG 59580

Active

Helianthus annuus L. · Sunflower

Remy Rouane

BG IT UA
8 records

LG 50549 SX

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

IT RO SK UA
9 records

LG5631 CL

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

RO SK UA
8 records

LG 50270

Active

Helianthus annuus L. · Sunflower

Remy Rouane

IT SK UA
7 records

LG 5654 CL

Protection expired

Helianthus annuus L. · Sunflower

LIMAGRAIN VERNEUIL HOLDING S.A.

IT SK UA
5 records

LG 5638

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

IT UA
6 records

Helesun SU

Active

Helianthus annuus L. · Sunflower

TEODORESCU ANDREEA

RO UA
9 records

LG50500

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

ES IT RO UA
8 records