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.

Sifra

Active

Solanum tuberosum L. · Potato

Rocus Pieter Graveland, Cornelus Johannus Biemond.

HR IT MT NL UA

25 records

Ukama

Active

Solanum tuberosum L. · Potato

Trip, J.

AT BE CZ DE DK ES +9

23 records

Saturna

Active

Solanum tuberosum L. · Potato

STADER| Stader Saatzucht eG

AT CZ DE EE FI FR +7

21 records

Salome

Active

Hordeum vulgare L. · Barley

Saaten-Union

AT CZ DE DK EE FI +7

29 records

Laura

Active

Solanum tuberosum L. · Potato

Richard Schuchmann^^^Heinrich Böhm

BG CZ DE HR HU LT +4

25 records

Carlita

Active

Solanum tuberosum L. · Potato

JA Crebas (NL)

BE BG DE DK EE FR +6

20 records

Arizona

Active

Solanum tuberosum L. · Potato

Sjefke Allefs

MT NL UA

27 records

Picasso

Active

Solanum tuberosum L. · Potato

KWEEEKBEDRYJF ROPTA-ZPC

BG DK EE ES FR IE +5

22 records

Jaerla

Active

Solanum tuberosum L. · Potato

ZPC Portugal

AT DE DK ES FR GR +7

22 records

Cleopatra

Active

Solanum tuberosum L. · Potato

ZPC

BE DE DK ES FR HR +6

19 records

Rosara

Active

Solanum tuberosum L. · Potato

VON KAMEKE KARTZ

CZ DE ES HR HU LT +5

24 records

Red Scarlett

Active

Solanum tuberosum L. · Potato

Y.P. van der Werff/ZPC

CZ EE HR HU IT LT +4

20 records

Lady christl

Active

Solanum tuberosum L. · Potato

MUIJSERS| J. Muijsers c/o C. Meijer B.V.

CZ DE FI FR NL PL +2

24 records

Verdi

Active

Solanum tuberosum L. · Potato

UNIPLANTA SAATZUCHT KG

CZ DE PL UA

24 records

Sylvana

Active

Solanum tuberosum L. · Potato

W R L SCHOLTENS

HR IT NL UA

26 records

Ivory Russet

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

22 records

Solara

Active

Solanum tuberosum L. · Potato

REITZIG DORLIES

AT CZ DE DK EE FR +8

20 records

Tomensa

Active

Solanum tuberosum L. · Potato

REITZIG DORLIES

AT CZ DE DK ES FR +7

20 records

Nikita

Application submitted

Solanum tuberosum L. · Potato

WOLF&WOLF

CZ DE DK ES FR HR +6

23 records

Vineta

Active

Solanum tuberosum L. · Potato

Yorh Ehhers

BG CZ DE EE HR HU +5

21 records

Ramos

Active

Solanum tuberosum L. · Potato

Van Rijn B.V.

BG CZ GR HR NL PL +2

25 records

Inova

Active

Solanum tuberosum L. · Potato

Van Rijn BV (NL)

CZ FR GR NL PL SK +1

22 records

Opal

Active

Solanum tuberosum L. · Potato

Solana, D

CZ DE HR PL UA

22 records

El Mundo

Active

Solanum tuberosum L. · Potato

STET HOLLAND

HR NL UA

21 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.