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.

Gevora

Active

Solanum lycopersicum L. · Tomato

SIA(EXTREMA)/E.ENSY(MALAG

2 records

Gourmet Sweet

Active

Solanum lycopersicum L. · Tomato

Poul Erik Olgaard

2 records

GEM 604

Terminated

Solanum lycopersicum L. · Tomato

UNITED GENETICS SEEDS CO

3 records

GR1510

Active

Solanum tuberosum L. · Potato

Grocep S.I.C.A.

3 records

Golotyna

Active

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

2 records

Gawin

Terminated

Solanum tuberosum L. · Potato

Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie

3 records

Goudski

Active

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

4 records

Gasol

Active

Capsicum annuum L. · Bell pepper

SEMILLAS FITO, S.A.

2 records

Gandawa

Terminated

Solanum tuberosum L. · Potato

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

4 records

Goda

Active

Solanum tuberosum L. · Potato

Lietuvos agrarinių ir miškų mokslų centras

3 records

Glycine

Active

Beta vulgaris Sugar Beet Group · Sugar beet

SESVANDERHAVE NV-SA, BE

2 records

Goldsegen

Active

Solanum tuberosum L. · Potato

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

3 records

Gloriette

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

2 records

Galadiant

Active

Solanum lycopersicum L. · Tomato

Graines Voltz (FR)

2 records

Fyper

Active

Solanum lycopersicum L. · Tomato

SEMILLAS FITO, S.A.

2 records

Gaheris

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

3 records

FORNER ALCAIDE 5

Active

Hybrids between Citrus x aurantium L. x Citrus trifoliata L.

3 records

Glorioso

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Fyone

Active

Solanum tuberosum L. · Potato

Andelskartoffelmelsfabrikken Vendsyssel A.m.b.A. (AKV Langholt A.m.b.A.)

4 records

Fury

Terminated

Raphanus sativus L. var. sativus · Radish

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

3 records

Framboo

Active

Solanum lycopersicum L. · Tomato

HAZERA SEEDS BV

3 records

GERMI113

Terminated

Solanum tuberosum L. · Potato

Germicopa SAS, FR

2 records

Geraldine

Active

Solanum tuberosum L. · Potato

Europlant Innovation GmbH & Co. KG

3 records

Georgetta KWS

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

2 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.