Diseases

Rhizoctonia

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.

Sources10

Breakdown by crop

Rhizoctonia Canker and Black Scurf of Potato 182 Rhizoctonia root rot — sugar beet 88 Rhizoctonia blight of tall fescue 26 Rhizoctonia root rot of table beet 16 Rice Sheath Blight 12 Rhizoctonia Root Rot — Fodder Beet 7 Rhizoctonia bottom rot of lettuce 7 Rhizoctonia blight — Perennial ryegrass 7 Rhizoctonia rot of radish 7 Rhizoctonia blight — Creeping bentgrass 6 Rhizoctonia root rot of beet 5 Rhizoctonia rot of carrot 4

Found in these crops

Potato 162 Sugar beet 119 Tall fescue 40 Garden beet 19 Lettuce 10 Perennial ryegrass 9 Mangelwurzel 9 Radish 8 Brown mustard 7 Beet 6 Creeping bentgrass 6 Triticale 5

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.

Romanze

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE ES HR LT UA

14 records

Soraya

Active

Solanum tuberosum L. · Potato

WOLFGANG Walter, DE

DE HR UA

16 records

Lilly

Active

Solanum tuberosum L. · Potato

SOLANA GMBH & CO KG

CZ DE UA

14 records

Wega

Active

Solanum tuberosum L. · Potato

Wolfgang Walter, Norika Nordring - Kartoffelzucht - und Vermehrungs - GmbH Gross Lusewitz

DE UA

16 records

Sorentina

Active

Solanum tuberosum L. · Potato

Justus Bohm

DE UA

15 records

Etana

Active

Solanum tuberosum L. · Potato

Heinrich Böhm

DE UA

13 records

Primabelle

Active

Solanum tuberosum L. · Potato

R.P.GRAVELAND

14 records

Tango

Active

Solanum tuberosum L. · Potato

STAShEVSKI ZENON / ZAMALIEVA FANIYa FAJZRAHMANOVNA / GIMAEVA ELENA ALEKSEEVNA / VOLOGIN SEMEN GERMANOVICh / SALIHOVA ZIFA ZAKAR'EVNA / GIZATULLINA AL'BINA TALGATOVNA / NAZMIEVA REZIDA RYaZAKOVNA / SAFIULLINA GUL'GENA FLYuNOVNA / KUZ'MINOVA OL'GA ANDREEVNA

CZ FR HR HU IT NL +1

10 records

Isabella KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

BE DE DK ES FR NL +1

10 records

Arosa

Active

Solanum tuberosum L. · Potato

ZIMMERMANN WILLI

DE HR HU IT LT SI +1

14 records

Junior

Protection expired

Solanum tuberosum L. · Potato

WOLF & WOLF B.V.

BE DE FR HR NL SK

15 records

Kestrel

Active

Beta vulgaris Garden Beet Group · Garden beet

Sakata Vegetables Europe, F

HR NL UA

12 records

Red Sonia

Active

Solanum tuberosum L. · Potato

Heinrich BOHM, DE

NL UA

15 records

King Russet

Active

Solanum tuberosum L. · Potato

Jan Boer

14 records

Lucata

Protection expired

Beta vulgaris Sugar Beet Group · Sugar beet

SYNGENTA SEEDS, A.B.

CZ DE DK ES FR NL +2

10 records

Elvira

Active

Solanum tuberosum L. · Potato

Soltau-Bergen eG

BE ES FR IE IT NL

12 records

Valisa

Active

Solanum tuberosum L. · Potato

VOGEL JOSEF

CZ DE LT LV PL

13 records

Granada

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DE IT NL UA

16 records

Barlexas II

Active

Festuca arundinacea Schreb. · Tall fescue

Barenbrug Holland BV (NL)

CZ FR HR IT RO

11 records

Bettina

Active

Solanum tuberosum L. · Potato

Nordostbayer. Saatbauverband GmbH

AT CZ DE HR SI

10 records

Cobra

Active

Agrostis stolonifera L. · Creeping bentgrass

International Seeds Inc. (US)

DE FR NL SE

14 records

Borwina

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE HR LT LU

10 records

Natascha

Active

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GMBH AND CO KG

DE HR UA

14 records

Kiebitz

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE HR UA

13 records

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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.