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.

Boogie

Protection expired

Beta vulgaris Sugar Beet Group · Sugar beet

Maribo Seed International ApS

BE DK ES FR

8 records

Natura KWS

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS, D

CZ DE HR PL

6 records

Vebeca

Active

Solanum tuberosum L. · Potato

V.B.B. FONDS

AT DE DK LV NL

6 records

Rufus

Active

Raphanus sativus L. var. oleiformis Pers. · Oil radish

THEODOR RUDLOFF

AT DE LT LV

8 records

Paulina

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

DE ES FR IT NL

7 records

Karida

Terminated

Solanum tuberosum L. · Potato

KWEEKINTITUUT KARNA

DE DK ES FR NL

6 records

Fabienna KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE&CO.KGaA, DE

DK ES FR LT SE

6 records

Linzer delikatess

Active

Solanum tuberosum L. · Potato

Saatbau Linz OÖ. Landes-Saatbaugen.reg.Gen.m.b.H.

AT BE FR LU NL

8 records

Karnico

Active

Solanum tuberosum L. · Potato

KWEEKINTITUUT KARNA

DE DK ES FR NL

6 records

BTS Smart 6655 N

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed

BE CZ NL PL UA

6 records

Elles

Terminated

Solanum tuberosum L. · Potato

LEESTEMAKER| B.F. Leestemaker / SMID| A. Smid

AT DE FR NL SE

6 records

Hansa

Active

Solanum tuberosum L. · Potato

VEREINIGTE SAATZUCHTEN (DE)

DE DK FR LU NL

8 records

Futura

Protection expired

Solanum tuberosum L. · Potato

IJSSELMEERPOLDERS B.V.

CZ DE GR HR NL

10 records

Astra

Active

Solanum tuberosum L. · Potato

DANESPO A/S

DE DK HR NL SK

10 records

Allstar

Active

Solanum tuberosum L. · Potato

Jan Lucas Spijkman, Johanna Maria Spijkman-Vergeer

EE LV NL PT SE

8 records

Aula

Protection expired

Solanum tuberosum L. · Potato

SAKA-RAGIS PFLANZENZUCHT GBR

AT DE ES IE NL

7 records

Arletta

Active

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

CZ NL PL SI SK

6 records

Angela

Protection expired

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm GmbH & Co. KG (DE)

CZ DE HR LT SK

10 records

Stroma

Active

Solanum tuberosum L. · Potato

Dunnet, J.

DK FR IE SE

10 records

Sk 46

Protection expired

Poa pratensis L. · Kentucky bluegrass

HR IT SI SK

6 records

Record

Active

Solanum tuberosum L. · Potato

Potato Marketing Board Edinbourgh Maner Place (UK)

FI HR IE SE

6 records

P8805

Protection expired

Zea mays L. · Maize

PIONEER OVERSEAS CORPORATION

AT BG RO UA

7 records

Polka

Active

Sinapis alba L. · White mustard

MATTON CLOVIS

AT BE DE PL

8 records

Meltador

Active

Lolium perenne L. · Perennial ryegrass

ILVO-PLANT 39

BE DE LU NL

9 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.