Pests

Nematodes

Nematodes are microscopic roundworm endoparasites that feed on plant sap and cause significant yield losses. Varietal resistance is provided by genetic mechanisms that prevent pest reproduction and is assessed according to the International Seed Federation scale.

Mentioned in descriptions 13 637 varieties reference book.

Nematodes are microscopic roundworms ranging from 0.3 to 2 mm in size that act as obligate plant parasites. Most species penetrate root, stem, or bulb tissues, causing growth inhibition, wilting, and patchy crop development, with tissue damage often facilitating secondary infections.

Varietal resistance to nematodes is based on the plant's genetic apparatus, including specific R-genes that limit the feeding or reproduction of the pest. In some cases, protection is provided by a hypersensitive response, where local cell death occurs at the site of infection.

Protection efficacy is evaluated using International Seed Federation codes: HR denotes high resistance with limited parasite development under high inoculum pressure, while IR indicates intermediate resistance. The level of protection is race-specific and depends on the specific species and pathotype of the nematode.

Sources10

Breakdown by crop

Root-knot nematodes of tomato 1 711 Potato nematodes 1 231 Nematodes of sugar beet 287 Pepper Nematodes 154 Nematodes — Oilseed radish 143 Nematodes in white mustard 105 Nematodes — Tomato (Interspecific Hybrids) 79 Alfalfa nematodes 62 Barley nematodes 55 Root-knot nematodes of tomato 49 Soybean cyst nematode 35 Grapevine Nematodes 32 Plum nematodes 24 Peach nematodes 22 Rice nematodes 22 Nematodes in black oat 21 Nematodes of oats 20 Citrus Nematode 19 Nematodes — Prunus amygdalus x Prunus persica 16 Nematodes of White Clover 15 Nematodes in Prunus davidiana × Prunus persica hybrids 14 Nematodes — Solanum torvum Sw. 14 Nematodes — common wheat 14 Nematodes — hybrids between Citrus x aurantium L. x Citrus trifoliata L. 13

Found in these crops

Tomato 1 709 Potato 1 216 Sugar beet 288 Bell pepper 152 Oil radish 143 White mustard 105 hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner 79 Alfalfa 62 Barley 53 Tomato 48 Soybean 33 Grapevine 32

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.

Satina

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DE HR HU LT PL +2

20 records

Milva

Active

Solanum tuberosum L. · Potato

VANDEL POTATOES I/S

BG CZ DE DK EE HR +2

22 records

Cicero

Active

Solanum tuberosum L. · Potato

Mme R.M. Schouten (NL)/J.A. Crebas (NL)

CZ DE FR GR HU IT +3

21 records

Courage

Active

Solanum tuberosum L. · Potato

VAN DER LEEST B^^^NAUTA J.G.

CZ EE GR HR HU IT +3

16 records

Madeleine

Active

Solanum tuberosum L. · Potato

R.J. Mansholt's Veredelingsbedrijf

BG HR MT NL PL UA

19 records

Miranda

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DK IT SI UA

20 records

Juliette

Active

Solanum tuberosum L. · Potato

GERMIMCOPA BREEDING (GERMICOPA SAS)

DE FR HU PL SK

21 records

Rumba

Active

Solanum tuberosum L. · Potato

Heinrich Böhm

DE FR NL UA

21 records

Melody

Active

Solanum tuberosum L. · Potato

J.P.M.Muijsers

BG NL PL SI

20 records

Gioconda

Active

Solanum tuberosum L. · Potato

KWEEEKBEDRYJF ROPTA-ZPC

ES IT NL

18 records

Bafana

Active

Solanum tuberosum L. · Potato

VAN RIJN-KWS B.V.

NL PL UA

19 records

Donata

Active

Solanum tuberosum L. · Potato

Justus Bohm

NL UA

19 records

KWS Chrissie

Active

Hordeum vulgare L. · Barley

KWS LOCHOW GMBH, DE

CZ DE DK EE FI FR +4

22 records

Fontane

Active

Hordeum vulgare L. · Barley

Sejet Planteforµdling I/S

AT CZ DE DK EE FI +5

17 records

Obelix

Protection expired

Solanum tuberosum L. · Potato

WESTMAAS| Arie Westmaas

BE DE DK ES FR IE +3

17 records

Accent

Active

Solanum tuberosum L. · Potato

S.HARTMANS/C.MEIJER BV

AT CZ DE ES FR NL +4

18 records

Donald

Active

Solanum tuberosum L. · Potato

Stet Holland Research BV (NL)

AT CZ DK FR HR IE +3

19 records

Princess

Active

Solanum tuberosum L. · Potato

Solana Agrarproducte GmbH & Co

CZ DE EE HR LT NL +3

16 records

Marfona

Active

Solanum tuberosum L. · Potato

P.G. KONSTZWAANSHOGK (AGRICO)

ES FR GR HR IE LU +2

18 records

Provento

Active

Solanum tuberosum L. · Potato

WOLF&WOLF

BG CZ ES FR HR NL +2

19 records

Kondor

Active

Solanum tuberosum L. · Potato

ROSEFIELD FARM

BG ES HR HU IE LU +2

19 records

Red Lady

Active

Solanum tuberosum L. · Potato

Solana Agrar Proukte GmBH & Co.

CZ GR HR LT UA

16 records

Atlantic

Active

Solanum tuberosum L. · Potato

Wbbetal USDA Beltsville ARC

DE FR HU PL PT

15 records

Sound

Active

Solanum tuberosum L. · Potato

Meijer C. BV (NL)

FR NL UA

18 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.