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.

SANTE'

Active

Solanum tuberosum L. · Potato

VEREDELINGSBEDRIJF VV

BG CZ EE HR HU IE +7

25 records

VR 808

Active

Solanum tuberosum L. · Potato

VAN RIJN-KWS B.V.

NL PL UA

25 records

MONA LISA

Active

Solanum tuberosum L. · Potato

Z.P.C. /F.G. VAN DER ZEE /G. VAN DER ZEE /P.J. VAN DER ZEE

BE CZ DE ES FR HR +5

23 records

PIROL'

Active

Solanum tuberosum L. · Potato

Yosef Fohel`

BG DE HR LT LU PL +1

19 records

Euro Star

Active

Solanum tuberosum L. · Potato

VAN RIJN-KWS B.V.

DE HR IT NL PL

18 records

Maris Bard

Active

Solanum tuberosum L. · Potato

PLANT BREEDING INTERNATIONAL CAMBRIDGE

ES HR IE IT NL SE +1

15 records

FL 05-107

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

UNIVERSITY OF FLORIDA, GULF COAST RESEARCH AND EDUCATION CENTER

14 records

Grand Slam

Active

Brassica oleracea L. (White Cabbage Group) · White cabbage

Yusuke KATO, JP

BG HR NL UA

10 records

Baby Lou

Active

Solanum tuberosum L. · Potato

SOLANA GMBH & CO KG

DE FR

11 records

7 four 7

Active

Solanum tuberosum L. · Potato

Jacob Eising

NL UA

16 records

MAE'STRO

Active

Solanum tuberosum L. · Potato

YaShINA IZOL'DA MAKSIMOVNA / RUSAKOVA IRINA GENNAD'EVNA / KALYaGIN YuRIJ NIKOLAEVICh / KABUNIN ALEKSANDR ANATOL'EVICh / KIRSANOVA E'L'ZA VLADIMIROVNA / LITOVChENKO ALEKSEJ EVGEN'EVICh

BG CZ FR SK

11 records

NK Fair

Protection expired

Brassica napus var. napus · Rapeseed

Syngenta Crop Protection AG

CZ DE DK PL UA

9 records

RS-3

Active

Vitis L. · Grapevine

UNIVERSITY OF CALIFORNIA KEARNEY AGRICULTURAL CENTER

9 records

RS-9

Active

Vitis L. · Grapevine

UNIVERSITY OF CALIFORNIA KEARNEY AGRICULTURAL CENTER

9 records

ROSALINDA KWS

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

BE DK FR SE

6 records

Nemo Netta

Active

Solanum lycopersicum L. · Tomato

NIRIT SEEDS

FR PL

8 records

N 6438

Active

Solanum lycopersicum L. · Tomato

Paul Degreef

NL UA

9 records

Heinz 3402

Active

Solanum lycopersicum L. · Tomato

HEINZSEED

HR PT

6 records

Kerr's Pink

Active

Solanum tuberosum L. · Potato

Landbruks- og matdepartementet, N - 0030 Oslo

ES IE

6 records

Black Pearl

Active

Solanum melongena L. · Eggplant

FRITS HERLAAR

NL UA

5 records

VVA 1

Active

Prunus L. · Plum

RESPUBLIKANSKOE NAUCHNO-PROIZVODSTVENNOE DOCHERNEE UNITARNOE PREDPRITIE «INSTITUT PLODOVODSTVA»

7 records

ML 99

Active

Medicago sativa L. · Alfalfa

PASTURE GENETICS

6 records

ISCI 20

Active

Brassica juncea (L.) Czern. · Brown mustard

CREA- CENTRO DI RICERCA PER LE COLTURE INDUSTRIALI (CREA-CI-BO)

6 records

Delta Pearl

Active

Gossypium hirsutum L. · Upland cotton

HANS JURGEN EVERS (T)

5 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.