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.

Tempora

Protection expired

Solanum tuberosum L. · Potato

Nordkartoffel Zuchtgesellschaft mbH

CZ DE NL SK

6 records

Santino

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

STRUBE GmbH&Co.KG, DE

DE FR HR HU

5 records

Smart Beppina KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS Saat SE, Einbeck DE

HR HU IT

5 records

Jadranka KWS

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS, D

DE HR HU

5 records

BTS 2510 N

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed Inc. (US)

BE DE FR NL

5 records

Bangor

Active

Beta vulgaris Fodder Beet Group · Mangelwurzel

DLF SEEDS A/S

BE CZ DK PL

5 records

Valetta

Active

Solanum tuberosum L. · Potato

SaKa Pflanzenzucht GmbH & Co. KG (DE)

CZ DE NL

10 records

Vittasso

Active

Brassica juncea (L.) Czern. · Brown mustard

LOCHOW| KWS LOCHOW GMBH

AT CZ DE

6 records

Zorro

Terminated

x Triticosecale Wittm. ex A. Camus · Triticale

Danko Hodowla Roslin Sp.z.o.o.

HU PL SE

6 records

Laurena

Terminated

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft mbH

AT DE SK

5 records

Evita

Active

Solanum tuberosum L. · Potato

Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.

AT CZ EE

11 records

Fabiola

Active

Solanum tuberosum L. · Potato

Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.

AT HR NL

6 records

Texto

Active

Daucus carota L. · Carrot

Vilmorin, F

FR HR

5 records

Riptide

Active

Agrostis stolonifera L. · Creeping bentgrass

Mountain View Seeds

CZ IT

6 records

Rover

Active

Raphanus sativus L. var. sativus · Radish

Bejo Zaden BV (NL)

HR NL

5 records

Korab

Active

Beta vulgaris Sugar Beet Group · Sugar beet

WIELKOPOLSKA HODOWLA BURAKA CUKROWEGO SP.Z.O.O

PL UA

5 records

Jola

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE UA

7 records

Guardian 21

Active

Festuca arundinacea Schreb. · Tall fescue

TurfOne & Rutgers, The State University of New Jersey

FR IT

6 records

Diego

Active

Raphanus sativus L. var. sativus · Radish

Wim van der Heijden

NL UA

6 records

Blackwatch

Active

Festuca arundinacea Schreb. · Tall fescue

TurfOne & Rutgers, The State University of New Jersey

FR IT

6 records

Boa

Active

Beta vulgaris Sugar Beet Group · Sugar beet

SESVANDERHAVE NV-SA, BE

FR UA

6 records

Cardeal

Active

Beta vulgaris Garden Beet Group · Garden beet

Sakata Vegetables Europe, F

FR UA

6 records

Baldio

Active

Daucus carota L. · Carrot

Jonh Pieter Schipper

NL UA

6 records

Java

Active

Solanum tuberosum L. · Potato

Teagasc

7 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.