Diseases
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.
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.
Brassica napus var. napus · Rapeseed
Brassica napus var. napus · Rapeseed
SAATBAU LINZ EGEN
Brassica napus var. napus · Rapeseed
HANS SVENSK, C/O SVALÖF WEIBULL AB
Helianthus annuus L. · Sunflower
Nicolae Parvu
Brassica napus var. napus · Rapeseed
Deutsche Saatveredelung AG,DE
Brassica napus var. napus · Rapeseed
RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NAN BELARUSI PO ZEMLEDELIYU»
Brassica napus var. napus · Rapeseed
Saatzucht Donau GmbH & Co.KG
Helianthus annuus L. · Sunflower
LIMAGRAIN EUROPE S.A.
Helianthus annuus L. · Sunflower
SEMILLAS CARGILL, S.A.
Brassica napus var. napus · Rapeseed
KWS MOMONT RECHERCHE SARL, FR
Helianthus annuus L. · Sunflower
LIMAGRAIN EUROPE S.A.
Helianthus annuus L. · Sunflower
LIDEA FRANCE SAS
Brassica napus var. napus · Rapeseed
KWS MOMONT RECHERCHE SARL, FR
Brassica napus var. napus · Rapeseed
Lidea France S.A.S
Helianthus annuus L. · Sunflower
LABOULET SEMENCES
Helianthus annuus L. · Sunflower
Joel Meunier
Helianthus annuus L. · Sunflower
Eugenio Tassinari
Helianthus annuus L. · Sunflower
PANAM FRANCE SARL
Helianthus annuus L. · Sunflower
Kucheryava Olena Ivanivna, Hyske Ivan Mykolayovich, Buchuchanu Mikhail Ivanovich,
Helianthus annuus L. · Sunflower
SINISA JOCIC / SANDRA CVEJIC / JOCKOVIC MILAN / RADEKA ILIJA / SRETEN TERZIC
Helianthus annuus L. · Sunflower
Shein, Steve
Brassica napus L. · Rapeseed
Bayer CropScience LP USA
Brassica napus var. napus · Rapeseed
Dirk Decherf
Brassica napus L. · Rapeseed
Teresa Huskowska