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.

Radical

Active

Raphanus sativus L. var. oleiformis Pers. · Oil radish

J. JOORDENS' ZAADHANDEL

BE DE HR NL SI

11 records

ST Rotterdam

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Strube GmbH Co.KG, Söllingen DE

BE CZ DE HU NL

8 records

Finka

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm GmbH & Co. KG (DE)

BG CZ DE SK UA

13 records

Fasan

Active

Solanum tuberosum L. · Potato

NORIKA NORDRING-KARTOFFELZUCHT UND VERMEHRUNGS-GMBH

DE HU LT LV PL

10 records

Delikat

Active

Solanum tuberosum L. · Potato

Yosef Fohel`

CZ DE LV PL UA

13 records

Concurrent

Protection expired

Solanum tuberosum L. · Potato

Kweekbedrijf-Zpc (NL)

BE ES FR IT NL

11 records

Donna

Protection expired

Trifolium repens L. · White clover

IGER Institute of Grassland & Environmental Research (GB)

AT DE DK FR IE

10 records

Turbo

Active

Solanum tuberosum L. · Potato

SMEENGE| Piet Smeenge / SMEENGE ALBERT| Albert Smeenge

DE ES FR NL

8 records

Alpha

Active

Medicago sativa L. · Alfalfa

Barenbrug Holland BV (NL)

AT CZ DE FR PL

11 records

Rally

Active

Solanum lycopersicum L. · Tomato

Enza Zaden, NL

BG HR NL UA

9 records

Mezzo

Active

Medicago sativa L. · Alfalfa

Klaus K. Nielsen

CZ FR NL UA

10 records

Navan

Active

Solanum tuberosum L. · Potato

PBI Cambridge (GB)

CZ HU IE SI

12 records

Maradonna

Active

Solanum tuberosum L. · Potato

Van Rijn Group

ES FR GR NL

10 records

Funtime

Active

Lactuca sativa L. · Lettuce

Syngenta Seeds BV (NL)

ES FR HR NL

9 records

Wawilow

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Strube, D

CZ HR UA

8 records

Toscana

Active

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GMBH AND CO KG

DE HR UA

12 records

Rodriga

Active

Solanum tuberosum L. · Potato

UNIPLANTA SAATZUCHT KG

DE HR UA

12 records

Sensation

Active

Solanum tuberosum L. · Potato

Temmerman Handels

IT NL UA

15 records

Occitane

Active

Medicago sativa L. · Alfalfa

Vincent Beguier

FR PT UA

10 records

Mont Blanc

Active

Solanum tuberosum L. · Potato

Jan van Loon

BE LU NL

11 records

Luxurial

Active

Avena strigosa Schreb. · Black oat

Panam France sarl (FR)/Panam Chili (CL)

FR IT LU

10 records

Emanuelle

Active

Solanum tuberosum L. · Potato

R.P.GRAVELAND

FR LU NL

11 records

Bernadette

Active

Solanum tuberosum L. · Potato

Winfried Lange

EE FR NL

13 records

Capri

Active

Solanum tuberosum L. · Potato

PRINCE (NL)

CZ DE FR

9 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.