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.

Genaros F1

Terminated

Solanum lycopersicum L. · Tomato

Maren Shurmans

1 record

GAUDI

Active

Capsicum annuum L. · Bell pepper

CAPITAL GENETIC EBT, S.L.

1 record

Gaia

Terminated

Solanum tuberosum L. · Potato

CENTRO INTERPROVINCIALE DI SPERIMENTAZIONE AGROAMBIENTALE MARIO NERI

1 record

FOLLA REDONDA

Application submitted

Vitis L. · Grapevine

AGACAL-AXENCIA GALEGA DA CALIDADE ALIMENTARIA

1 record

FSG408DP

Active

Medicago sativa L. nothosubsp. varia (Martyn) Arcang. · Bastard Medic

Mike Velde

1 record

FLHORBAN909

Terminated

Musa L. · Banana

CIRAD-Flhor (FR)

1 record

Forsag F1

Terminated

Solanum lycopersicum L. · Tomato

Jean Clause Mercier

2 records

Fotyniia

Active

Solanum tuberosum L. · Potato

BORIVSKYI ANATOLII, BONDARCHUK ANATOLII, FURDYHA MYKOLA, KUPRIIANOVA TETIANA, TAKTAIEV BORYS, TOMASH ANATOLII, ZAKHARCHUK NATALIIA, SOBRAN IVAN, HUNCHAK VOLODYMYR, CHEREDNYCHENKO LIUBOV

2 records

FORNER ALCAIDE 47

Withdrawn

Citrus reticulata Blanco · Mandarin orange

IVIA

1 record

FLORIX

Terminated

Pisum sativum L. · Pea

Nunhems Zaden BV (NL)

1 record

Geisha Girl GOF

Terminated

Calendula officinalis L. · Pot marigold

PlantiCo Hodowla i Nasiennictwo Ogrodnicze Golebiew sp. z o.o.

1 record

GARDEL RS

Terminated

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

1 record

G 550

Terminated

Sorghum bicolor (L.) Moench subsp. bicolor · Sorghum

FUNK SEED

1 record

Fantini

Application submitted

Solanum tuberosum L. · Potato

J.M. Kannegieter

2 records

G 499GBR

Withdrawn

Sorghum bicolor (L.) Moench subsp. bicolor · Sorghum

FUNK SEED

1 record

G 4507

Terminated

Zea mays L. subsp. mays (Maize Group) · Maize

FUNK SEED

1 record

Fenda F1

Active

Solanum lycopersicum L. · Tomato

Mercier Jean-Claude

1 record

Fazan

Active

Solanum tuberosum L. · Potato

Yosef Fohel`

2 records

Fortix F1

Application submitted

Solanum lycopersicum L. · Tomato

Sylvain Bontems

2 records

FINALIST

Withdrawn

Solanum lycopersicum L. var. lycopersicum · Tomato

NIRIT SEEDS

1 record

Esmira F1

Active

Solanum lycopersicum L. · Tomato

Kees Reinink

2 records

FERRERO

Application submitted

Solanum lycopersicum L. · Tomato

INTERSEMILLAS SAU

1 record

Escapade

Withdrawn

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

1 record

Fantastic GOF

Terminated

Tagetes erecta L. · African marigold

PlantiCo Hodowla i Nasiennictwo Ogrodnicze Golebiew sp. z o.o.

1 record

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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.