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.
Zea mays L. · Maize
RAGT 2N S.A.S
Raphanus sativus L. var. sativus · Radish
Jan Draaistra
Beta vulgaris Sugar Beet Group · Sugar beet
SYNGENTA SEEDS, A.B.
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
HERVE DUBREUIL_
Solanum tuberosum L. · Potato
Wolfgang Walter
Brassica juncea (L.) Czern. · Brown mustard
LAMMERS SEED OPTIONS
Festuca arundinacea Schreb. · Tall fescue
Peak Plant Genetics, LLC & Rutgers, The State University of New Jersey
Festuca arundinacea Schreb. · Tall fescue
Mountain View Seeds
Solanum tuberosum L. · Potato
Wolfgang Walter
Lolium perenne L. · Perennial ryegrass
BRETT YOUNG
Festuca arundinacea Schreb. · Tall fescue
LEBANON TURF
Beta vulgaris Garden Beet Group · Garden beet
BEJO ZADEN
Lolium perenne L. · Perennial ryegrass
ZAJAC PERFORMANCE SEEDS
Festuca arundinacea Schreb. · Tall fescue
PURE SEED TESTING
Festuca arundinacea Schreb. · Tall fescue
PURE SEED TESTING
Poa pratensis L. · Kentucky bluegrass
JACKLIN SEED
Poa pratensis L. · Kentucky bluegrass
PURE SEED TESTING
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Beta vulgaris Sugar Beet Group · Sugar beet
Florimond Desprez Veuve et Fils, FR
Solanum tuberosum L. · Potato
Justus Böhm
Festuca arundinacea Schreb. · Tall fescue
Rutgers, The State University of New Jersey and Jacklin Seed by Simplot
Festuca arundinacea Schreb. · Tall fescue
SEED RESEARCH OF OREGON
Poa pratensis L. · Kentucky bluegrass
The Scotts Company