Diseases
Ramularia collo-cygni
Ramularia leaf spot is a fungal disease of barley that manifests as rectangular reddish-brown spots with a chlorotic halo. The disease is characterized by high harmfulness and often occurs in a latent form, complicating visual diagnosis.
Mentioned in descriptions 432 varieties reference book.
Ramularia leaf spot appears as pinpoint necroses and rectangular lesions about 2×0.5 mm in size, which are restricted by leaf veins and are clearly visible on both sides of the leaf blade. The spots have a reddish-brown color with a characteristic yellow chlorotic halo, and sporulation in the form of black dots can develop on the dead tissues.
The development of the pathogen is most intense at temperatures from +15°C to +20°C and high air humidity exceeding 85–95%. The disease usually becomes noticeable in the second half of the growing season, starting from the heading or flowering stage, although primary signs may appear significantly earlier.
The evaluation of variety resistance is carried out using phytopathological monitoring methods with visual assessment of the degree of leaf surface infection. Given the ability of the pathogen to develop as an endophyte and the complexity of diagnosis, PCR methods are used for accurate pathogen identification during variety trials.
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.
Hordeum vulgare L. · Barley
Saatzucht Donau GmbH & Co.KG
Hordeum vulgare L. · Barley
Sejet Planteforaedling I,S
Hordeum vulgare L. · Barley
Saatzucht Donau GmbH & Co.KG
Hordeum vulgare L. · Barley
Pajbjergfonden (DK)
Beta vulgaris Sugar Beet Group · Sugar beet
Strube-Dieckmann GmbH and Co.KG Dr. Hermann Strube
Hordeum vulgare L. · Barley
Pajbjergfonden
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Crop Protection AG, CH
Hordeum vulgare L. · Barley
Syngenta UK Ltd
Hordeum vulgare L. · Barley
Syngenta Participations AG
Hordeum vulgare L. · Barley
Pajbjergfonden
Hordeum vulgare L. · Barley
SAATZUCHT JOSEF BREUN GMBH and CO.KG
Hordeum vulgare L. · Barley
SAATZUCHT JOSEF BREUN GMBH and CO.KG
Hordeum vulgare L. · Barley
NICKERSON (UK)
Hordeum vulgare L. · Barley
Sejet Planteforaedling I,S
Hordeum vulgare L. · Barley
Sejet Planteforaedling I,S
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE NV-SA, BE
Hordeum vulgare L. · Barley
Sejet Planteforaedling I,S
Hordeum vulgare L. · Barley
Sejet Planteforaedling I,S
Hordeum vulgare L. · Barley
Pajbjergfonden, DK-8300 Odder
Hordeum vulgare L. · Barley
Syngenta UK Ltd
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Seeds
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Hordeum vulgare L. · Barley
Sejet Plantbreeding (DK)