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 Onion 119 Bread wheat 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.

Maremosso

Active

Solanum lycopersicum L. · Tomato

Nunhems B.V.

4 records

Meltomy

Active

Solanum lycopersicum L. · Tomato

Bejo Zaden B.V.

3 records

Malinche

Active

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

4 records

Marmo

Active

Solanum lycopersicum L. var. lycopersicum · Tomato

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

2 records

Marinika

Active

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

4 records

Manarola

Active

Lactuca sativa L. · Lettuce

Vilmorin-Mikado SAS (FR)

2 records

Melville

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Magika

Active

Allium cepa L. · Onion

Cora Seeds SRL, I

2 records

Marbruni

Active

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

3 records

Malbec

Active

Allium cepa L. var. cepa · Onion

Enza Zaden Beheer B.V.

3 records

Madalyon

Active

Solanum lycopersicum L. · Tomato

Bayer Holland B.V.

2 records

Melody

Application submitted

Fragaria L. · Strawberry

JAMES HUTTON LTD

2 records

LYRIC

Active

Solanum lycopersicum L. · Tomato

HAZERA GENETICS

2 records

Magnum Salt

Active

Medicago sativa L. · Alfalfa

Velde Mike John

3 records

Maestro F1

Application submitted

Daucus carota L. · Carrot

Vilmorin & Cie

4 records

Mecano

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

3 records

Marsunny

Active

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

3 records

M 9 T337

Active

Malus domestica (Suckow) Borkh. · Apple

3 records

Lorka

Protection expired

Phaseolus vulgaris L. · Common bean

GOLDEN WEST SEED RESEARCH Co.

2 records

Marnouar

Active

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

3 records

Marnero

Active

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

3 records

Lutecia

Active

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

2 records

Luxor

Active

Glycine max (L.) Merr. · Soybean

Semican INC (CA)

2 records

Mathaios

Active

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

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

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Diseases

Powdery mildew 33 570
Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
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.