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.

Tresor

Active

Solanum tuberosum L. · Potato

WOLF & WOLF BV (NL)

BG CZ FR HR NL SK

15 records

Milvus

Active

Trifolium pratense L. · Red clover

Forschungsanstalt Agroscope Reckenholz-Tänikon ART Herrn Dr. Beat Boller

AT DE EE FR LU PL

16 records

Draga

Active

Solanum tuberosum L. · Potato

Hettema Zonen Kweekbedrijf B.V.

ES FR IE IT LU NL

15 records

Bonus

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

BG DE HR PL UA

14 records

Albatros

Active

Solanum tuberosum L. · Potato

VOGEL JOSEF| Dr. Josef Vogel

CZ DE LT PL UA

17 records

Azur

Active

Solanum tuberosum L. · Potato

ZIMMERMANN WILLI| Willi Zimmermann

CZ DE ES FR

11 records

Artemis

Active

Medicago sativa L. · Alfalfa

Barenbrug Holland BV (NL)

AT DE FR PL

11 records

Arrow

Active

Solanum tuberosum L. · Potato

MARIEN WINTERS_ / J. J. H. M. ALLEFS_ / J. J. VAN HOOGEN_

HR NL SI UA

13 records

Winston

Active

Solanum tuberosum L. · Potato

Jack Dunnett

IE LT NL

12 records

Viviana

Active

Solanum tuberosum L. · Potato

Heinrich BOHM, DE

HR PL UA

14 records

Erika

Active

Solanum tuberosum L. · Potato

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

AT DE FR

12 records

Delphine

Active

Solanum tuberosum L. · Potato

SAATZUCHT FRITZ LANGE KG, DE

DE NL UA

14 records

Talentine

Active

Solanum tuberosum L. · Potato

R.P.GRAVELAND

FR NL

13 records

Sanibel

Active

Solanum tuberosum L. · Potato

Justus Bohm

NL UA

16 records

Red Sonia

Active

Solanum tuberosum L. · Potato

Heinrich BOHM, DE

NL UA

15 records

Kelly

Active

Solanum tuberosum L. · Potato

Gisele Lairy-Joly, Gisele Lairy-Joly, Germicopa Breeding, France

FR UA

13 records

Evolution

Active

Solanum tuberosum L. · Potato

RICHARD MOOIJWEER

NL UA

15 records

Estrella

Active

Solanum tuberosum L. · Potato

Winfried Lange, Frank Lange

DE UA

16 records

Corinna

Active

Solanum tuberosum L. · Potato

Heinrich Böhm

DE UA

12 records

Concordia

Active

Solanum tuberosum L. · Potato

Heinrich BOHM, DE

DE HR

13 records

Amany

Active

Solanum tuberosum L. · Potato

LAIRY-JOLY Gisele

FR NL

12 records

Aurea

Active

Solanum tuberosum L. · Potato

Station de Recherche du Comité Nord G.I.E.

FR UA

17 records

King Russet

Active

Solanum tuberosum L. · Potato

Jan Boer

14 records

Kingsman

Active

Solanum tuberosum L. · Potato

DOUGLAS HARLEY

15 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.