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.

Amigo

Active

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

PHP PETERSEN

4 records

Arendell

Active

Solanum lycopersicum L. · Tomato

Nunhems B.V.

4 records

Angus

Active

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

PHP PETERSEN

5 records

Alfagraze

Active

Medicago sativa L. · Alfalfa

University of Georgia Research Foundation

5 records

Alizee

Terminated

Solanum tuberosum L. · Potato

Station de Recherche du Comite Nord, F-76110

5 records

Aisha

Active

Solanum tuberosum L. · Potato

IPR B.V.

7 records

Agent

Active

Sinapis alba L. · White mustard

SELGEN A.S

6 records

Adorelle

Active

Solanum lycopersicum L. · Tomato

Syngenta Crop Protection AG

5 records

Adundas

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

Verity

Application submitted

Solanum tuberosum L. · Potato

CAITHNESS POTATO BREEDERS LTD

6 records

Safiyah

Active

Solanum tuberosum L. · Potato

Mr Anto Beets, Anto Beets of Maatschap Beets- Siertsema

5 records

Pike

Protection expired

Solanum tuberosum L. · Potato

Plaisted, PL

4 records

Midnight Bayou

Active

Heuchera L. · Coral Flower

Janet N. Egger

4 records

Miracle

Active

Heuchera L. · Coral Flower

Sandrine Delabroye

4 records

Greenpac

Active

hybrids between Prunus davidiana, Prunus dulcis and Prunus persica

Pinochet Jorge|Barcelona, ES

5 records

Harborough Harvest

Terminated

Solanum tuberosum L. · Potato

SCRI / DAFS

4 records

Carolina Strongback

Active

Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon

William Wechter^^^Amnon Levi^^^Richard Hassell

4 records

Bonita

Active

Ipomoea batatas (L.) Lam. · Sweet potato

LaBonte Don R. / Villordon Arthur Q. / Smith Tara / Clark Christopher A.

4 records

Rixxer

Protection expired

Zea mays L. · Maize

RAGT 2N S.A.S

IT SI UA

6 records

Kirkpinar

Active

Oryza sativa L. · Rice

Trakya Agricultural Research Institute (TR)

4 records

Stoneville 506

Protection expired

Gossypium hirsutum L. · Upland cotton

STONEVILLE PEDIGREED SEED COMPANY

ES GR

4 records

Pietra Rossa

Active

Solanum lycopersicum L. · Tomato

Michael Edwin Kuenh

FR UA

4 records

Heinz 9280

Terminated

Solanum lycopersicum L. · Tomato

HEINZSEED

PL PT

3 records

CXD 277

Terminated

Solanum lycopersicum L. · Tomato

HM Clause Inc (US)

FR PT

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.