Diseases
Cercospora beticola
Cercospora leaf spot is a fungal plant disease that causes leaf spotting, necrosis, and a significant yield reduction due to the disruption of photosynthesis.
Mentioned in descriptions 2 072 varieties reference book.
The disease manifests as small circular spots measuring 2–5 mm, light brown or grayish in color with a characteristic purple or reddish-brown border. Under high humidity, a velvety coating, representing the fungus's sporulation, forms in the center of the affected areas. Subsequently, the spots coalesce, causing yellowing, necrosis, and premature death of the leaf blade, which forces the plant to expend stored nutrients on foliage regeneration.
The development of the pathogen depends on weather conditions, requiring temperatures in the range of +20 °C to +30 °C and a high relative humidity above 70–90%. The presence of free moisture on the leaf surface is critical for the fungus to penetrate through the stomata. The infection persists in the soil on plant debris as mycelium and can be transmitted via seed material.
Evaluation of the resistance of varieties and hybrids is conducted during variety trials based on a visual method, where the degree of infestation is recorded as a percentage of the leaf area or on multi-point scales. Experts use phytomonitoring and regular surveys to determine the infection spread dynamics. Based on the observation results, samples are ranked by resistance groups, which helps agronomists select hybrids capable of maintaining a healthy leaf apparatus until the end of the vegetation period.
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.
Daucus carota L. · Carrot
Ger Beemsterboer
Daucus carota L. · Carrot
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Daucus carota L. · Carrot
Ger Beemsterboer
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
Maribo Seed International ApS
Beta vulgaris Sugar Beet Group · Sugar beet
SYNGENTA SEEDS| INAKTIV Syngenta Seeds GmbH
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE, N.V./S.A.
Beta vulgaris Sugar Beet Group · Sugar beet
Societe Europeenne de Semences NV/SA (BE)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Daucus carota L. · Carrot
Bejo Zaden BV, NL-1749 ZH Warmenhuizen
Beta vulgaris Sugar Beet Group · Sugar beet
Strube GmbH Co.KG, Söllingen DE
Daucus carota L. · Carrot
Bejo Zaden (NL)
Festuca arundinacea Schreb. · Tall fescue
DLF-TRIFOLIUM DANSK PLANTEFORAEDLING
Beta vulgaris Sugar Beet Group · Sugar beet
VANDERHAVE SUGAR BEET SEED
Beta vulgaris Sugar Beet Group · Sugar beet
STRUBE GmbH&Co.KG, DE
Daucus carota L. · Carrot
Bejo Zaden, NL
Daucus carota L. · Carrot
Paul Degreef
Daucus carota L. · Carrot
Bejo Zaden, NL
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE, N.V./S.A.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE, N.V./S.A.
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed