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.

Heinz1651

Active

Solanum lycopersicum L. · Tomato

HEINZSEED

2 records

Heinz1534

Active

Solanum lycopersicum L. · Tomato

HEINZSEED

2 records

Heinz 9494

Terminated

Solanum lycopersicum L. · Tomato

HEINZSEED

2 records

Heinz2128

Active

Solanum lycopersicum L. · Tomato

HEINZSEED

3 records

Ibrax

Terminated

Solanum lycopersicum L. · Tomato

Syngenta Seeds B.V.

2 records

Ibeth

Active

Solanum lycopersicum L. · Tomato

Syngenta Seeds B.V.

4 records

Havana

Active

Solanum tuberosum L. · Potato

Charles Hartveld

5 records

Harryetta KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

2 records

Guiomar

Active

Solanum lycopersicum L. · Tomato

MERIDIEM SEEDS S.L.

2 records

Hajduk

Active

Solanum tuberosum L. · Potato

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

4 records

Grintoso

Terminated

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Hugo

Active

Solanum torvum Sw. · Turkey berry

AKIRA SEEDS S.L.

2 records

Gundega

Active

Solanum tuberosum L. · Potato

Gunta Bebre

3 records

Gustodona

Application submitted

Solanum lycopersicum L. · Tomato

Syngenta Crop Protection AG

4 records

Green Grazer

Terminated

Sorghum x drummondii (Steud.) Millsp. & Chase · Sudangrass

Pannar Seed (Pty) Ltd

2 records

Guadajira

Active

Solanum lycopersicum L. · Tomato

SIA(EXTREMA)/E.ENSY(MALAG

2 records

Hetman

Active

Solanum tuberosum L. · Potato

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

8 records

Honoka

Active

Solanum lycopersicum L. · Tomato

Ikasido Global Group B.V (NL)

3 records

Hermanito

Active

Solanum lycopersicum L. · Tomato

TSI Italia S.R.L.

3 records

Herbstgold

Active

Solanum tuberosum L. · Potato

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

3 records

Graffito

Terminated

Capsicum annuum L. · Bell pepper

CREA-CENTRO DI RICERCA PER L'ORTICOLTURA (CREA-OF-PON)

2 records

Heinz7709

Terminated

Solanum lycopersicum L. · Tomato

HEINZSEED

2 records

Harper

Active

Solanum lycopersicum L. · Tomato

Erma Zaden (IL)

2 records

Gravesac

Active

Vitis L. · Grapevine

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

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.