Diseases

Root rots

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.

Sources10

Breakdown by crop

Root rots — common wheat 125 Root rots of sugar beet 75 Pea Root Rots 73 Tomato root rot 72 Raspberry root rots 55 Root rots — garden strawberry 47 Root rots of lettuce 43 Alfalfa Root Rot 40 Cucumber root rot 40 Tobacco root rots 35 Barley root rots 35 Maize Root Rots 33 Root rots of soybean 29 Root rots — red clover 20 Root rots — Onion 17 Root rots of Calibrachoa 17 Apple root rot 16 Bean root rots 15 Root rots — Onion 13 Root rots — durum wheat 13 Apple Root Rots 11 Root rots of triticale 10 Root rots of subterranean clover 10 Maize root rot 8

Found in these crops

Tomato 573 Sugar beet 141 Onion 136 Bread wheat 119 Onion 119 Garden strawberry 91 Pea 75 Red raspberry 64 Lettuce 60 hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner 58 Soybean 53 Alfalfa 53

Varieties that feature this in their description

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.

WL 326 GZ

Protection expired

Medicago sativa L. · Alfalfa

W-L Research

2 records

Volicia

Terminated

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Whitney

Terminated

Allium cepa L. var. cepa · Onion

Seminis Vegetable Seeds

2 records

Xidejia

Active

Solanum lycopersicum L. · Tomato

NUNHEMS BEIJING SEEDS CO.

4 records

Vima Zanta

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

3 records

Xantara

Active

Solanum lycopersicum L. · Tomato

Axia Vegetable Seeds B.V.

3 records

Vimoso

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Vertyco

Terminated

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

3 records

Voluptuoso

Active

Solanum lycopersicum L. · Tomato

Clause (FR)

2 records

Vancrisp

Protection expired

Lactuca sativa L. · Lettuce

ROYAL SLUIS

2 records

Vallandzo

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Vivary

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Veronica

Active

Solanum lycopersicum L. var. lycopersicum · Tomato

S.A.I.S. Societa Agricola Italiana Sementi

2 records

Venere

Terminated

Phaseolus coccineus L. · Runner bean

CREA-CENTRO DI RICERCA PER L'ORTICOLTURA (CREA-OF-PON)

2 records

Varsity

Active

Solanum lycopersicum L. · Tomato

Syngenta Crop Protection AG

4 records

Utrero

Active

Allium cepa L. var. cepa · Onion

Nunhems B.V.

7 records

Ustica

Active

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

4 records

Trumpetor

Active

Medicago sativa L. · Alfalfa

NORTHRUP KING Co (US)

3 records

Vaincoeur

Active

Solanum lycopersicum L. · Tomato

Monsanto Vegetable IP Management B.V.

4 records

Tronix

Active

hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner

SEMILLAS FITO, S.A.

2 records

Tradicia

Terminated

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

UGI 57414

Active

Solanum lycopersicum L. · Tomato

UNITED GENETICS SEEDS CO

2 records

UGI 1852

Active

Solanum lycopersicum L. · Tomato

UNITED GENETICS ITALIA S.P.A

3 records

Tovale

Terminated

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

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Diseases

Powdery mildew 33 570
Fusarium wilt and blight 29 887
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Downy mildew 16 384
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.