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 Carrot 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.

Woltario

Protection expired

x Triticosecale Wittm. ex A. Camus · Triticale

Danko Hodowla Roslin Sp. Zo.o., Pl- 64-000 Koscian

EE FI LT PL SI SK

13 records

Sitro

Active

Brassica napus L. · Rapeseed

DEUTSCHE SAATVEREDELUNG AG

EE HU LT LV RO SK +1

9 records

Laetitia

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS Saat AG, DE

BE ES FR HR HU NL +1

9 records

Marinka

Active

Brassica napus var. napus · Rapeseed

MORTEN HELT POULSEN

DE DK ES IE PL

11 records

Arkula

Protection expired

Solanum tuberosum L. · Potato

VEB SAAT

DE ES HR IE NL SI

12 records

Esperanza

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

CZ DE ES FR NL PL

9 records

Molli

Active

Solanum tuberosum L. · Potato

VOGEL JOSEF| Dr. Josef Vogel

CZ DE LV PL UA

13 records

Corvinia

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

DE DK FR NL SE

8 records

Finelawn

Active

Festuca arundinacea Schreb. · Tall fescue

DLF-TRIFOLIUM DANSK PLANTEFORAEDLING

CZ HR HU IT RO

10 records

Wawilow

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Strube, D

CZ HR UA

8 records

Toscana

Active

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GMBH AND CO KG

DE HR UA

12 records

Merlot

Active

Solanum tuberosum L. · Potato

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

LV UA

11 records

Jurata

Active

Solanum tuberosum L. · Potato

Heinrich Böhm

LU PL

11 records

Sinatra

Active

Solanum tuberosum L. · Potato

Saka Pflanzenzucht GmbH Co KG

10 records

Boomerang

Protection expired

Beta vulgaris Sugar Beet Group · Sugar beet

VANDERHAVE SUGAR BEET SEED

BE FR GR HR HU NL

8 records

Vedeta

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Syngenta Seeds

BE CZ FR NL

8 records

Verona

Active

Solanum tuberosum L. · Potato

UNIPLANTA| Uniplanta - Saatzucht KG

CZ DE NL PL

19 records

Angus

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Dr. Niels H. Gram

DK FR SE UA

7 records

Marta

Active

Solanum tuberosum L. · Potato

SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4

CZ DE PL

10 records

Barna

Active

Solanum tuberosum L. · Potato

Teagasc Oak Park Research Centre

ES IE NL

10 records

Barcesar

Active

Festuca arundinacea Schreb. · Tall fescue

Barenbrug Holland BV (NL)

DE FR IT

9 records

Natalia

Active

Solanum tuberosum L. · Potato

SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4

DE UA

10 records

Mia

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE UA

11 records

Allora

Active

Solanum tuberosum L. · Potato

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

LV UA

10 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.