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
Lidea France SAS, FR
Brassica napus var. napus · Rapeseed
RAPS Gbr Saatzucht Lundsgaard (DE)
Brassica napus L. · Rapeseed
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG
Brassica napus var. napus · Rapeseed
Limagrain Europe S.A.S
Brassica napus var. napus · Rapeseed
KWS MOMONT RECHERCHE SARL, FR
Brassica napus var. napus · Rapeseed
MONSANTO TECHNOLOGY
Brassica napus var. napus · Rapeseed
MONSANTO TECHNOLOGY
Brassica napus var. napus · Rapeseed
Deutsche Saatveredelung AG - DSV (DE)
Brassica napus L. · Rapeseed
Rapool Bulgaria EOOD (BG)
Brassica napus L. · Rapeseed
Thomas Foubert
Brassica napus L. · Rapeseed
MONSANTO TECHNOLOGY
Helianthus annuus L. · Sunflower
Tierry Andre
Brassica napus var. napus · Rapeseed
Lidea France S.A.S
Brassica napus var. napus · Rapeseed
CAUSSADE| Caussade Semences (Societe Anonyme a Directoire)
Brassica napus var. napus · Rapeseed
MONSANTO TECHNOLOGY
Helianthus annuus L. · Sunflower
Joel Meunier
Brassica napus var. napus · Rapeseed
Gunhild Leckband Dieter Stelling
Helianthus annuus L. · Sunflower
SEMILLAS BATLLE S.A.
Helianthus annuus L. · Sunflower
Maurizio Lottari
Brassica napus var. napus · Rapeseed
Nelly Guguin, Jean-Pierre Despeghel,
Brassica napus var. napus · Rapeseed
Almut Hampe
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Seeds
Brassica napus var. napus · Rapeseed
MONSANTO TECHNOLOGY
Brassica napus var. napus · Rapeseed