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.

C_32

Active

Citrus L. · Citrus

2 records

CPB_4475

Active

Citrus L. · Citrus

2 records

CARBAP K74

Active

Musa x paradisiaca L. · Banana

Centre de coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Centre Africain de Recherches sur Bananiers et Plantains (CARBAP)

1 record

BARRIER 1

Active

Prunus L. · Plum

2 records

Burgundy

Active

Ipomoea batatas (L.) Lam. · Sweet potato

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

1 record

C 35

Active

Citrus L. · Citrus

3 records

ADEMIR

Active

Prunus L. · Plum

C.S.I.C. (MADRID)

2 records

AMANDIER X PÊCHER GF 677

Active

Prunus x persicoides (Ser.) M. Vilm. & Bois · Peach x Almond

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

Alabanda

Terminated

Gerbera L. · Gerbera

Piet Schreurs Holding B.V.

1 record

Ademir

Terminated

Prunus cerasifera Ehrh. · Cherry plum

CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS(CSIC)

2 records

FLAHMAN

Terminated

Oryza sativa L. · Rice

Los` Halyna Danylivna, Chukhyr` Iryna Mykolaivna, Kharytonov IEvhenii Mykhailovych, Ruban Vasyl` IAkovych, Shylovskyi Valentyn Mykolaiovych,

2 records

E21Y989

Active

Glycine max (L.) Merr. · Soybean

Schillinger Genetics Inc

1 record

ALFA II

Protection expired

Medicago sativa L. · Alfalfa

W WEIBULL

1 record

UG849

Active

Solanum lycopersicum L. · Tomato

1 record

UG4014

Active

Solanum lycopersicum L. · Tomato

1 record

UG 822

Active

Solanum lycopersicum L. · Tomato

1 record

Thanur

Active

Solanum lycopersicum L. · Tomato

1 record

Sarazin F1

Terminated

Cucumis sativus L. · Cucumber

2 records

Lilliput V.F.N. ibrido F 1

Active

Solanum lycopersicum L. · Tomato

1 record

Yup

Active

Solanum lycopersicum L. · Tomato

1 record

Vesta

Application submitted

Solanum tuberosum L. · Potato

1 record

Vesnianka

Withdrawn

Solanum tuberosum L. · Potato

1 record

Vipon

Terminated

Solanum lycopersicum L. · Tomato

1 record

Vait Ledi

Application submitted

Solanum tuberosum L. · Potato

1 record

1 2 ... 173 174 175 176 177 178 179 ... 188 189 Next

Jump to page 27 54 76 81 108 135 162 166 186

Pests

All terms →

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.