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.
Lolium perenne L. · Perennial ryegrass
Pickseed USA, Inc. & Rutgers, The State University of New Jersey
Festuca arundinacea Schreb. · Tall fescue
DLF Trifolium A-S, DK
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum tuberosum L. · Potato
VEREINIGTE SAATZUCHTEN (DE)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS| KWS SAAT AG
Solanum tuberosum L. · Potato
Kartoffelzucht Böhm GmbH & Co. KG (DE)
Brassica napus var. napus · Rapeseed
Deutsche Saatveredelung AG - DSV (DE)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
KWS Saat AG, DE
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Crop Protection AG, CH
Solanum tuberosum L. · Potato
Saka-Ragis (DE)
Solanum tuberosum L. · Potato
Heinrich Böhm
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Crop Protection AG
Solanum tuberosum L. · Potato
PLANT BREEDING INTERNATIONAL CAMBRIDGE
Festuca arundinacea Schreb. · Tall fescue
Z Seeds, LLC and Rutgers, The State University of New Jersey
Solanum tuberosum L. · Potato
Station de Recherche du ComitÚ Nord
Solanum tuberosum L. · Potato
Justus Bohm
Daucus carota L. · Carrot
ROGER FREEMAN
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
Solana, D
Agrostis stolonifera L. · Creeping bentgrass
DLF SEEDS A/S
Ornithopus sativus Brot. · Serradella
Nutt Bradley
Beta vulgaris Sugar Beet Group · Sugar beet
Maribo Seed International ApS, DK
Beta vulgaris Sugar Beet Group · Sugar beet
KWS, D