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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 Mangelwurzel 9 Perennial ryegrass 9 Radish 8 Brown mustard 7 Creeping bentgrass 6 Beet 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.

PIROL'

Active

Solanum tuberosum L. · Potato

Yosef Fohel`

BG DE HR LT LU PL +1
19 records

Baby Lou

Active

Solanum tuberosum L. · Potato

SOLANA GMBH & CO KG

DE FR
11 records

7 four 7

Active

Solanum tuberosum L. · Potato

Jacob Eising

NL UA
16 records

ISCI 20

Active

Brassica juncea (L.) Czern. · Brown mustard

CREA- CENTRO DI RICERCA PER LE COLTURE INDUSTRIALI (CREA-CI-BO)

IT
6 records

Crystal Blue Links

Active

Agrostis stolonifera L. · Creeping bentgrass

PURE SEED TESTING

IT
7 records

Velox

Active

Solanum tuberosum L. · Potato

SAKA-RAGIS PFLANZENZUCHT GBR

AT BG CZ DE EE FI +6
28 records

Rosara

Active

Solanum tuberosum L. · Potato

VON KAMEKE KARTZ

CZ DE ES HR HU LT +5
24 records

Sagitta

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

CZ IT NL PL UA
27 records

Verdi

Active

Solanum tuberosum L. · Potato

UNIPLANTA SAATZUCHT KG

CZ DE PL UA
24 records

Gala

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

BG DE LT LU UA
22 records

Everest

Active

Solanum tuberosum L. · Potato

Van Rijn Group

CZ GR HR NL SK
19 records

Romina

Active

Solanum tuberosum L. · Potato

NIEDERSTERREICHISCHE SAATBAUGENOSSENSCHT

AT DK EE ES FR HR +4
18 records

Kennebec

Active

Solanum tuberosum L. · Potato

USDA MAINE

ES FR GR HR IT LU +3
15 records

Satina

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DE HR HU LT PL +2
20 records

Vivaldi

Active

Solanum tuberosum L. · Potato

van der Zee, G. / van der Zee, Pieter

CZ FR HR IT LT NL +1
21 records

Miranda

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DK IT SI UA
20 records

Gioconda

Active

Solanum tuberosum L. · Potato

KWEEEKBEDRYJF ROPTA-ZPC

ES IT NL
18 records

Accent

Active

Solanum tuberosum L. · Potato

S.HARTMANS/C.MEIJER BV

AT CZ DE ES FR NL +4
18 records

Cochise

Active

Festuca arundinacea Schreb. · Tall fescue

PICKSEED WEST INC

CZ EE FR HR HU IT +4
19 records

Princess

Active

Solanum tuberosum L. · Potato

Solana Agrarproducte GmbH & Co

CZ DE EE HR LT NL +3
16 records

Ludmilla

Active

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GMBH AND CO KG

DE UA
22 records

Granola

Active

Solanum tuberosum L. · Potato

SAKA-RAGIS PFLANZENZUCHT GBR

CZ DE ES HR IE NL +1
16 records

Romano

Active

Solanum tuberosum L. · Potato

Veredelingsbedrijf B.V.

HR HU IE NL SI UA
15 records

Caruso

Active

Solanum tuberosum L. · Potato

Saka Pflanzenzucht, D

DE HR UA
16 records

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