Diseases
Root rots are a complex of soil-borne fungal diseases affecting the underground part and the basal zone of plants. The infection manifests latently and leads to a 15–40% reduction in crop productivity.
Mentioned in descriptions 5 232 varieties reference book.
Root rots represent a group of pathologies affecting roots, tillering nodes, and underground internodes. The disease manifests as stand thinning, necrosis and browning of the root system, as well as the appearance of brown spots, streaks, and coatings on the basal part of the stem. External signs are often hidden and masked as nutrient deficiencies or winterkill, which is expressed in plant stunting, stem breakage, empty ears, and shriveled grain.
Disease development depends on a combination of abiotic factors and agronomic conditions. The infection actively progresses under excessive soil moisture, crop rotation violations, monoculture cropping, and the use of infected seed material. Mineral nutrient imbalance, especially potassium and phosphorus deficiency combined with nitrogen excess, reduces the natural immunity of plants, creating favorable conditions for pathogen activity across a wide temperature range.
In breeding practice, resistance to rots is often defined as tolerance—the ability of a plant to maintain productivity when infected. Variety evaluation is conducted on artificial and natural infection nurseries using quantitative disease scales from 1 to 9. Biophysical and conductometric methods are used for rapid analysis of the degree of tissue damage by pathogenic toxins.
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.
Asparagus officinalis L. · Asparagus
Ger Beemsterboer
hybrids between Prunus avium and Prunus pseudocerasus
National Seed Development Organisation Ltd / East Malling Research Station
Solanum lycopersicum L. · Tomato
Enza Zaden (NL)
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Kees Konst
Allium cepa L. var. cepa · Onion
SHAMROCK SEED COMPANY
Glycine max (L.) Merr. · Soybean
First Line Seeds Ltd (CA)
Trifolium pratense L. · Red clover
Slechtitelská stanice Hladké Zivotice spol.s.r.o.
Phaseolus vulgaris L. · Common bean
SYNGENTA SEEDS B.V.
Glycine max (L.) Merr. · Soybean
W.G. Thompson & Sons Ltd (CA)
Solanum lycopersicum L. · Tomato
Kees Konst
Medicago sativa L. · Alfalfa
HORTAG SEED CO.
Asparagus officinalis L. · Asparagus
Ger Beemsterboer
Brassica oleracea L. (White Cabbage Group) · White cabbage
Jan Draaistra
Medicago sativa L. · Alfalfa
NORTH AMERICAN PLANT BREEDERS
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Asparagus officinalis L. · Asparagus
Limseeds B.V.
Solanum lycopersicum L. · Tomato
Nunhems B.V.
Lactuca sativa L. · Lettuce
ENZA ZADEN
Trifolium subterraneum L. · Subterranean clover
S .A. Seeds Marketers Pty. Ltd
Solanum lycopersicum L. · Tomato
Nunhems Netherlands BV
Pisum sativum L. · Pea
CRITES SEEDS
Allium cepa L. · Onion
NUNHEMS B.V.
Agrostis stolonifera L. · Creeping bentgrass
Seed Research of Oregon & Rutgers, The State University of New Jersey