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.

Wega

Active

Solanum tuberosum L. · Potato

Wolfgang Walter, Norika Nordring - Kartoffelzucht - und Vermehrungs - GmbH Gross Lusewitz

DE UA

16 records

Volare

Active

Solanum tuberosum L. · Potato

MARIEN WINTERS

NL UA

16 records

Sorentina

Active

Solanum tuberosum L. · Potato

Justus Bohm

DE UA

15 records

Nectar

Active

Solanum tuberosum L. · Potato

Teagasc Oak Park Research Centre

IE UA

16 records

Etana

Active

Solanum tuberosum L. · Potato

Heinrich Böhm

DE UA

13 records

Tilbury

Active

Solanum tuberosum L. · Potato

Gisele Lary Joly

14 records

Primabelle

Active

Solanum tuberosum L. · Potato

R.P.GRAVELAND

14 records

Lady Terra

Active

Solanum tuberosum L. · Potato

HESELMANS GUUS

14 records

Smart Latoria KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Werner Beyer Monica Weber Maik Gertz Dietrich Hauer

BE DE DK ES NL PL +2

11 records

Karatop

Active

Solanum tuberosum L. · Potato

Prof.Dr.sc. Christfried Pfeffer / Dr. Paul Steinbach

CZ DE DK LT LV PL +2

12 records

Anosta

Active

Solanum tuberosum L. · Potato

STOL L.D. (US)

CZ EE FR IE LU LV +2

10 records

Delfine

Active

Solanum lycopersicum L. · Tomato

Syngenta Seeds, NL

BG CZ FR HR NL PL +2

11 records

Samba

Active

Solanum tuberosum L. · Potato

ZAMALIEVA FANIYa FAJZRAHMANOVNA / GIMAEVA ELENA ALEKSEEVNA / VOLOGIN SEMEN GERMANOVICh / SALIHOVA ZIFA ZAKAR'EVNA / GIZATULLINA AL'BINA TALGATOVNA / NAZMIEVA REZIDA RYaZAKOVNA / SAFIULLINA GUL'GENA FLYuNOVNA / KUZ'MINOVA OL'GA ANDREEVNA / SKLYaROVA NADEZh

BE DE DK ES FR IE +1

12 records

Litember

Active

Sinapis alba L. · White mustard

Euro Grass Breeding GmbH Co. KG

DE DK EE LT LU LV +1

12 records

Mentor

Protection expired

Hordeum vulgare L. · Barley

W WEIBULL

DE DK EE FI LT LV +1

21 records

Romula

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm GmbH & Co. KG

CZ HR IT LT PL SI +1

15 records

Arosa

Active

Solanum tuberosum L. · Potato

ZIMMERMANN WILLI

DE HR HU IT LT SI +1

14 records

Derby

Active

Solanum tuberosum L. · Potato

JANSEN A.

GR HU IT LT MT NL +1

13 records

Leyla

Active

Solanum tuberosum L. · Potato

NORDKARTOFFELZUCHTGESELLSCHAFT

DE DK EE ES FR NL +1

12 records

Cigale

Active

Medicago sativa L. · Alfalfa

Florimond Desprez Veuve et Fils, FR

AT CZ DE EE FR NL +1

14 records

Amadeus

Terminated

Solanum tuberosum L. · Potato

KWEEKBEDRIJF ROPTA ZPC

DE DK ES FR IE IT +1

10 records

Alwara

Active

Solanum tuberosum L. · Potato

Wolf Lange (DE)

BG DE DK EE FR LV +1

11 records

Angelia

Active

Phacelia tanacetifolia Benth. · Lacy phacelia

PETERSEN| Asmus Soeren Petersen in Fa. P.H. Petersen Saatzucht Lundsgaard GmbH & Co KG

AT CZ DE DK HU PL +1

15 records

Aminca

Active

Solanum tuberosum L. · Potato

HETTEMA ZONEN KWEEK. B.V.

BE EE ES FR IE NL +1

15 records

1 2 ... 6 7 8 9 10 11 12 ... 188 189 Next

Jump to page 19 27 54 81 108 109 135 162

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.