Diseases
Rhizoctonia solani
Rhizoctonia is a polyphagous disease affecting underground and near-ground plant organs at all vegetation stages. The pathogen manifests as rots, stem and root ulcers, and sclerotia on tubers, which leads to sparse emergence and reduced commercial crop quality.
Mentioned in descriptions 1 239 varieties reference book.
Rhizoctonia manifests as sprout rotting, the formation of dark sunken ulcers on stems and roots, and the development of 'black scurf' or a mycelial mat in the near-ground area. During the vegetation period, leaf curling can be observed, and dense black formations known as sclerotia develop on the tuber surface.
Disease development depends on weather conditions, soil type, and agronomic practices, with a prolonged cold and wet spring being the most hazardous. The pathogen actively develops in heavy, acidic, and waterlogged soils, while its spread is facilitated by high plant density and the use of infected material.
In variety trials, resistance is evaluated by planting material in an artificial infection background with subsequent monitoring during the emergence, budding, and harvesting phases. The criteria include the degree of damage to sprouts, roots, and stolons, as well as the surface area of tubers covered by sclerotia compared to control samples.
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.
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum tuberosum L. · Potato
Saatzucht Rudolf Pohl K.G.
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Beta vulgaris Sugar Beet Group · Sugar beet
Lion Seeds LTD (GB)
Beta vulgaris Sugar Beet Group · Sugar beet
STRUBE GMBH&CO.KG
Lactuca sativa L. · Lettuce
Graines Gautier SA (FR)
Brassica rapa L. subsp. pekinensis (Lour.) Hanelt · Napa cabbage
Beta vulgaris Sugar Beet Group · Sugar beet
KWS, D
Solanum tuberosum L. · Potato
SAKA| SaKa Pflanzenzucht GmbH & Co. KG
Beta vulgaris Fodder Beet Group · Mangelwurzel
KWS SAAT SE & CO.KGAA
x Triticosecale Wittm. ex A. Camus · Triticale
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Capsicum annuum L. · Bell pepper
TAKII EUROPE B V
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE, N.V./S.A.
Beta vulgaris Fodder Beet Group · Mangelwurzel
SAS FLORIMOND-DESPREZ Veuve et Fils
Brassica napus L. · Rapeseed
DEUTSCHE SAATVEREDELUNG AG
Festuca arundinacea Schreb. · Tall fescue
DLF-Trifolium (DK)
Beta vulgaris Sugar Beet Group · Sugar beet
Danisco Seed A/S (Danisco Sugar A/S)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Raphanus sativus L. var. sativus · Radish
Hazera Seeds B.V.
Raphanus sativus L. var. sativus · Radish
Hazera Seeds B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
KWS| KWS SAAT AG
Cichorium intybus L. (Industrial Chicory Group) · Chicory
Florimond Desprez Veuve et Fils, FR
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.