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
RUTGERS UNIVERSITY OF NEW JERSEY
Solanum tuberosum L. · Potato
Landbrugets Kartoffelfond
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Beta vulgaris Sugar Beet Group · Sugar beet
Florimond Desprez Veuve et Fils, FR
Festuca arundinacea Schreb. · Tall fescue
DLF-TRIFOLIUM DANSK PLANTEFORAEDLING
Beta vulgaris Garden Beet Group · Garden beet
BEJO ZADEN B V
Beta vulgaris Sugar Beet Group · Sugar beet
WIELKOPOLSKA HODOWLA BURAKA CUKROWEGO SP.Z.O.O
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Raphanus sativus L. var. sativus · Radish
Hazera Seeds B.V.
Beta vulgaris Garden Beet Group · Garden beet
UNITED GENETICS SEEDS CO
Beta vulgaris Garden Beet Group · Garden beet
Winseed International Ltd (NZ)
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE NV-SA, BE
Solanum tuberosum L. · Potato
J. Boer
Festuca arundinacea Schreb. · Tall fescue
LEBANON TURF
Beta vulgaris Garden Beet Group · Garden beet
Sakata Seed America Inc. Woodland Innovation Center
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Solanum tuberosum L. · Potato
Šiaurės-Vakarų ŽŪMTI
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE NV-SA, BE
Euphorbia pulcherrima Willd. ex Klotzsch · Poinsettia
Guido von Tubeuf
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Beta vulgaris Fodder Beet Group · Mangelwurzel
Florimond Desprez Veuve et Fils, FR
Solanum tuberosum L. · Potato
Adolf Kellermann^^^Sanja Randjelovic
Solanum tuberosum L. · Potato
Europlant America LLC
Festuca arundinacea Schreb. · Tall fescue
Grassland Oregon