Menes
ActiveCapsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.
ES
2 records
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.
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
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.
Mayor
TerminatedPrunus amygdalus x Prunus persica
RODRIGUEZ NAVARRO JOAQUIM
ES
4 records
Maïwen
ActiveSolanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
FR
3 records
Meldela
ActiveLolium multiflorum Lam. ssp. italicum (A. Br.) Volkart · Italian ryegrass
ILVO-PLANT 39
BE
2 records
Maupiti
Application submittedSolanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
ES
2 records
Lycomech 467
ActiveSolanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
PT
2 records
Lusitano
ActiveSolanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
PT
2 records
Magnum Salt
ActiveMedicago sativa L. · Alfalfa
Velde Mike John
UA
3 records
Maxxiany XR
ActiveSolanum lycopersicum L. · Tomato
Axia NL B.V.
NL
4 records
Maxine
TerminatedSolanum lycopersicum L. · Tomato
HAZERA GENETICS
ES
2 records
Magneto
ActiveSolanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
ES
3 records
Macizo
ActiveSolanum lycopersicum L. · Tomato
RAMIRO ARNEDO, S.A.
ES
2 records
LS 1278
ActiveSolanum lycopersicum L. · Tomato
LARK SEEDS INTERNATIONAL, USA
BG
2 records
Mazur
ActiveSolanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
PL
3 records
Markyno
ActiveSolanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
PT
2 records
Maaspower
Application submittedhybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Nunhems Netherlands B.V.
NL
6 records
Marnouar
ActiveSolanum lycopersicum L. · Tomato
Gautier Semences SAS (FR)
FR
3 records
Lutecia
ActiveSolanum lycopersicum L. · Tomato
Gautier Semences SAS (FR)
FR
2 records
Mathaios
Activehybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
4 records
Marchante
ActiveSolanum lycopersicum L. · Tomato
HAZERA SEEDS BV
ES
3 records
Mariana GF 8-1
ActivePrunus maritima Marshall · Beach-plum
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
FR
2 records
Luigi
ActiveSolanum lycopersicum L. · Tomato
HM.Clause S.A.S.
FR
3 records
Marella
ActivePisum sativum L. · Pea
Saatzucht Aschersleben Herrn Dr. Peter Römer
DE
3 records
LS 1351
ActiveSolanum lycopersicum L. · Tomato
LARK SEEDS INTERNATIONAL, USA
BG
2 records