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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.

Sunset Magic

Active

Crassula ovata (Mill.) Druce · Jade plant

Ovata B.V.

2 records

Royal Gems

Active

Hibiscus L. · Hibiscus

Fleming, David W.|8101 S. 14th St., Lincoln, NE 68512 / Fleming, James R.|8101 S. 14th St., Lincoln, NE 68512

2 records

Silver Flame

Active

Sansevieria zeylanica (L.) Willd. · Ceylon bowstring-hemp

F.R. Ornamentales S.A.

2 records

Spark Plug

Active

Carex phyllocephala T. Koyama

Korlipara Harini

3 records

RFDD

Active

Agapanthus L'Hér. · Lily of the Nile

CAPE SEED AND BULB (PTY) LTD

2 records

Reco

Active

x Cuprocyparis leylandii (A. B. Jacks. & Dallim.) Farjon · Leyland cypress

van den Dool Pieter|Boskoop 2771 AK, NL

2 records

Royalty

Application submitted

Verbascum L. · Mullein

Korlipara Harini|Canby, OR, US

2 records

Salinas

Active

Guzmania Ruiz et Pav. · Guzmania

Luc Pieters, Caroline De Meyer

2 records

SAKPXC047

Application submitted

x Petchoa J. M. H. Shaw · Petchoa

Moriya Kawashima

2 records

SAKIMP078

Application submitted

Impatiens New Guinea Group · New Guinea Impatiens

SHINJI MINEMURA

2 records

SAKPXC045

Application submitted

x Petchoa J. M. H. Shaw · Petchoa

Moriya Kawashima

2 records

Rubina

Active

Streptocarpus x hybridus Voss · Cape primrose

Fleischle Gartenbau GbR

2 records

Roulette Cherry

Active

Streptocarpus x hybridus Voss · Cape primrose

Fleischle Gartenbau GbR

2 records

Royal Gems

Active

Hibiscus moscheutos L. · Crimson-eyed rose mallow

Fleming's Flower Fields Inc.

2 records

Red Sun

Active

Gaillardia x grandiflora hort. ex Van Houtte · Blanket flower

Korlipara Harini

2 records

Picador

Active

Pastinaca sativa L. · Parsnip

Elsoms Seeds

2 records

PENRHUB

Withdrawn

Nemesia Vent. · Nemesia

SIDNEY JAMES JONES|DAVID JAMES JONES

2 records

OVPEARLS15

Application submitted

Echeveria agavoides Lem. · Molded wax agave

Ovata B.V.

2 records

Novanepjun

Active

Nepeta x faassenii Bergmans ex Stearn · Faassen's catnip

MICHAEL S DOBRES

2 records

Panorama

Active

Pastinaca sativa L. · Parsnip

Elsoms Seeds

2 records

Myersblue

Active

Eryngium x zabelii Christ ex Bergmans

JEFF HODSON

2 records

Mincream

Withdrawn

Deutzia gracilis Siebold & Zucc. · Japanese Snowflower

Hortival Diffusion SAS

2 records

MERENSKY 6

Application submitted

Persea americana Mill. · Avocado

Zelda van Rooyen^^^Sylvie Kremer-Kohne

2 records

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