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.
Festuca arundinacea Schreb. · Tall fescue
MCCARTHY RESEARCH FARM
Glycine max (L.) Merr. · Soybean
Minnesota Agricultural Experiment Station
Solanum tuberosum L. · Potato
Europlant Innovation GmbH & Co. KG
Glandularia x hybrida (hort. ex Groenl. & Rümpler) G. L. Nesom & Pruski · Common Garden Verbena
Syngenta Seeds B.V.
Festuca arundinacea Schreb. · Tall fescue
The Scotts Company
Solanum tuberosum L. · Potato
RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NACZIONALNOJ AKADEMII NAUK BELARUSI PO KARTOFELEVODSTVU I PLODOOVOSHHEVODSTVU»
Lolium perenne L. · Perennial ryegrass
Lofts Seed Company, Inc.
Festuca arundinacea Schreb. · Tall fescue
Loft's Seed Inc. (US)
Daucus carota L. · Carrot
Nunhems B.V.
Zea mays L. · Maize
MAY AGRO SEED CORP.
Euphorbia pulcherrima Willd. ex Klotzsch · Poinsettia
von Tubeuf Guido
Ageratum houstonianum Mill. · Flossflower
Syngenta Seeds B.V.
Lupinus albus L. · White lupin
GENETIC SERVICES S.R.L.
Beta vulgaris Sugar Beet Group · Sugar beet
Hendrik Tschoep
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Beta vulgaris L. · Beet
MariboHilleshög ApS
Beta vulgaris Sugar Beet Group · Sugar beet
KWS Saat AG, DE
Beta vulgaris Sugar Beet Group · Sugar beet
KWS Saat SE, Einbeck DE
Solanum tuberosum L. · Potato
Lietuvos agrarinių ir miškų mokslų centras
Solanum tuberosum L. · Potato
Lietuvos agrarinių ir miškų mokslų centro Vokės filialas
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE N.V./S.A.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE N.V./S.A.
Solanum tuberosum L. · Potato
Lietuvos agrarinių ir miškų mokslų centro Vokės filialas
Solanum tuberosum L. · Potato
RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NACZIONALNOJ AKADEMII NAUK BELARUSI PO KARTOFELEVODSTVU I PLODOOVOSHHEVODSTVU»