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.

Fionara KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

BE DE FR NL

5 records

Sunday

Terminated

Brassica napus var. napus · Rapeseed

Werner Horn

DE DK PL

7 records

Tyking

Active

Solanum lycopersicum L. · Tomato

UNITED GENETICS SEEDS CO

ES FR NL PT

5 records

ST Amsterdam

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Strube GmbH Co.KG, Söllingen DE

BE DE HU NL

5 records

Rebecca KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS, D

HR HU IT

5 records

Verbano

Protection expired

Phaseolus vulgaris L. · Common bean

SYNGENTA SEEDS B.V.

BE FR HU NL

6 records

Terrapin Smart

Active

Beta vulgaris Sugar Beet Group · Sugar beet

SESVANDERHAVE N.V./S.A., Tienen BE

HU IT LT UA

5 records

SW Kerstin

Active

Avena sativa L. · Oat

Svalöf Weibull (SE)

EE LT LV SE

9 records

Smart Renja KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

BE DK LT SE

5 records

Procura

Protection expired

Solanum tuberosum L. · Potato

PRUMMEL J.

EE FR NL SE

7 records

Promesse

Protection expired

Solanum tuberosum L. · Potato

PRUMMEL J.

FR IE NL SE

5 records

Sartre

Active

Hordeum vulgare L. · Barley

Sejet Planteforaedling I,S

DK EE LT PL

6 records

Sanetta

Protection expired

Beta vulgaris Sugar Beet Group · Sugar beet

Syngenta Crop Protection AG, CH

BE DE FR PL

5 records

Resyset

Protection expired

Solanum lycopersicum L. · Tomato

ROYAL SLUIS

CZ NL PL SK

6 records

Revelino

Protection expired

Solanum tuberosum L. · Potato

INNOSEEDS

DK FR IE NL

7 records

Olympia

Active

Solanum tuberosum L. · Potato

VON KAMEKE (DE)

CZ DE FR NL

7 records

Precocix

Protection expired

Solanum lycopersicum L. · Tomato

Syngenta Seeds B.V.

ES HU NL PL

5 records

Nemakill

Protection expired

Beta vulgaris Sugar Beet Group · Sugar beet

Hilleshog AB (SE)

DK ES FR SE

5 records

Mondial

Protection expired

Solanum lycopersicum L. · Tomato

Fryts Kherlaar

BG HR NL UA

6 records

Jenna

Terminated

Solanum lycopersicum L. · Tomato

Rijk Zwaan B.V. (NL)

HR NL PL SI

5 records

Klimt

Active

Beta vulgaris Sugar Beet Group · Sugar beet

STRUBE GMBH AND CO. KG

DK FR LT SE

5 records

Kartel

Terminated

Solanum tuberosum L. · Potato

Kweekinstituut KARNA (NL)

DE FR NL PL

5 records

Francina KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

BE DE FR NL

7 records

Espada

Active

Solanum lycopersicum L. · Tomato

Cora Seeds SRL, I

HU NL UA

5 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.