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.

LS 0836

Active

Solanum lycopersicum L. · Tomato

LARK SEEDS INTERNATIONAL, USA

2 records

LS 0594

Active

Solanum lycopersicum L. · Tomato

LARK SEEDS INTERNATIONAL, USA

2 records

LS 0502

Active

Solanum lycopersicum L. · Tomato

LARK SEEDS INTERNATIONAL, USA

2 records

Luiza

Protection expired

Solanum tuberosum L. · Potato

MIKE LUIZA

3 records

Lewis

Active

Capsicum annuum L. · Bell pepper

Enza Zaden Beheer B.V.

2 records

LS 1313

Active

Solanum lycopersicum L. · Tomato

LARK SEEDS INTERNATIONAL, USA

2 records

Lazarino

Active

Solanum lycopersicum L. · Tomato

SEMILLAS FITO, S.A.

3 records

Lesvos

Application submitted

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

3 records

Lemonax

Active

Solanum lycopersicum L. · Tomato

Axia Vegetable Seeds B.V.

3 records

Leire

Active

Solanum tuberosum L. · Potato

NEIKER-INSTITUTO VASCO DE INVESTIGACIÓN Y DESARROLLO AGRARIO, S.A.

3 records

Legendario

Active

Solanum lycopersicum L. · Tomato

UNITED GENETICS SEEDS CO

2 records

Liwia

Active

Beta vulgaris Sugar Beet Group · Sugar beet

WIELKOPOLSKA HODOWLA BURAKA CUKROWEGO SP.Z.O.O

3 records

Lech

Terminated

Solanum tuberosum L. · Potato

Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR

3 records

Leeloo

Active

Solanum lycopersicum L. · Tomato

Graines Voltz (FR)

2 records

Lawenda

Active

Solanum tuberosum L. · Potato

Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR

5 records

Lebrijano

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Lawina

Active

Solanum tuberosum L. · Potato

Olsztyńska Hodowla Ziemniaka i Nasiennictwo OLZNAS-CN sp. z o.o.

6 records

Linares

Active

Solanum lycopersicum L. · Tomato

SEMILLAS FITO, S.A.

2 records

LS 0450

Active

Solanum lycopersicum L. · Tomato

LARK SEEDS INTERNATIONAL, USA

2 records

Linuxis

Active

Solanum lycopersicum L. · Tomato

SEMILLAS FITO, S.A.

2 records

Lanzarote

Active

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

4 records

La Bomba

Active

Solanum tuberosum L. · Potato

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

2 records

Kwintella

Active

Solanum lycopersicum L. · Tomato

HAZERA SEEDS BV

3 records

Kurakao

Application submitted

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

3 records

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Pests

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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.