Diseases

Phoma rot

Phoma

Phoma rot is a group of fungal diseases manifesting as dry rots, stem necroses, and the appearance of characteristic black pycnidia dots. The disease affects a wide range of crops, causing significant yield losses both in the field and during storage.

Mentioned in descriptions 3 836 varieties reference book.

The disease manifests as the appearance of light brown to dark brown spots on leaves and stems, which can spread and infect the entire plant. Black dots, representing fungal pycnidia, form on the affected tissue areas, while depressed ulcers with a crumbling internal structure form upon infection of root crops and tubers.

The development of the pathogen depends on temperature conditions in the range of +10…+25°C and high air humidity exceeding 70–80%. The infection persists in the soil on plant debris for up to 3–6 years and is also transmitted through infected seeds, tubers, and root crops, which determines a high risk of spread in various climatic zones.

The assessment of variety resistance is carried out within the state variety testing system on specialized plots over several years. In field conditions, specialists conduct a visual scoring of plant infestation, which allows determining varietal responsiveness to the pathogen as an important economic and biological trait.

Varietal resistance to Phoma rot rarely constitutes full immunity and is considered an element of an integrated approach to crop protection. The selection of a resistant variety must be combined with adherence to crop rotation, returning the crop to the same field no earlier than after 3–4 years, and the use of healthy seed material.

Sources10

Breakdown by crop

Phoma stem canker of oilseed rape 529 Phoma black stem of sunflower 479 Phoma stem canker of rapeseed 215 Potato gangrene 12 Phoma Leaf Spot — Table Beet 3 Phoma rot of carrot 3 Phoma stem canker — white mustard 3

Found in these crops

Rapeseed 537 Sunflower 473 Rapeseed 213 Potato 12 Lemon 8 Onion 6 Garden beet 4 White mustard 3 Carrot 2 Onion 2 Alfalfa 2 Maize 2

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

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 56.35

Active

Helianthus annuus L. · Sunflower

LIMAGRAIN VERNEUIL HOLDING S.A.

BG IT RO SK UA

13 records

LG 5542 CL

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG ES IT RO UA

16 records

Maris Bard

Active

Solanum tuberosum L. · Potato

PLANT BREEDING INTERNATIONAL CAMBRIDGE

ES HR IE IT NL SE +1

15 records

LG 55.80

Active

Helianthus annuus L. · Sunflower

Limagrain Verneuil Holding (FR)

BG IT SK UA

13 records

Es-Astrid

Active

Brassica napus var. napus · Rapeseed

RUSTICA (FR)

CZ DE DK FR IE PL

17 records

PX 113

Active

Brassica napus var. napus · Rapeseed

Pioneer Overseas Corporation US (USA)

FR HR IE UA

13 records

LG 50521 CLP

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

ES IT RO SK UA

12 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 5478

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

AT HU IT UA

11 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

PR 44 D 06

Active

Brassica napus var. napus · Rapeseed

Pioneer Overseas Corporation US (USA)

DK FI FR HR UA

10 records

PR 46 W 14

Active

Brassica napus var. napus · Rapeseed

PIONEER SALES| Pioneer Hi-Bred Northern Europe Sales Division GmbH

DE DK FR HR

15 records

San Luca

Active

Helianthus annuus L. · Sunflower

Y. Stoyanova, P. Petrov, V. Velkov, F. Tsvetkova, P. Ivanov, A. Piskov, M. Hristov, D. Petakov, N. Nenov, V. Venkov, L. Nikolova, P. Shindrova, V. Encheva-Vasileva

AT BG DE ES FR IT

16 records

PT 234

Active

Brassica napus var. napus · Rapeseed

Pioneer Overseas Corporation US (USA)

DE DK HR UA

13 records

PT 315

Active

Brassica napus var. napus · Rapeseed

PIONEER OVERSEAS CORPORATION US

CZ DE DK FR PL UA

15 records

NK Rocky

Active

Helianthus annuus L. · Sunflower

SYNGENTA SEEDS AG, CH

AT BG FR HU UA

10 records

LG 50689 SX

Active

Helianthus annuus L. · Sunflower

Remy ROUANET

BG ES HU IT RO UA

11 records

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.