Mackenzie
ActiveSolanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
NL
5 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.
Médina
ActiveSolanum lycopersicum L. · Tomato
Vilmorin SA (FR)
FR
4 records
Marselan
ActiveCapsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
4 records
Lotos
TerminatedHordeum vulgare L. · Barley
Dr. J. Ackermann & Co. Saatzucht Irlbach (Kommanditgesellschaft) Herrn Dr. Claus Einfeldt
DE
5 records
Lunarossa
ActiveSolanum tuberosum L. · Potato
Piet H.Smeenge
NL
6 records
Luna
TerminatedSolanum tuberosum L. · Potato
ZIMMERMANN WILLI| Willi Zimmermann
DE
5 records
Manchar
ActiveBromus inermis Leyss. · Smooth brome
Washington Agricultural Experment Station, Washinton 99164
HR
3 records
LS16748
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
5 records
Mariner
ActiveCapsicum annuum L. · Bell pepper
CLAUSE, S.A.
ES
3 records
Likobol
ActiveSolanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
PT
3 records
Lukas
ActiveSolanum tuberosum L. · Potato
Saka Pflanzenzucht GmbH Co KG
DE
4 records
Lidivia
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Licapo
ActiveBrassica napus var. napus · Rapeseed
Dipl.Ing.agr. Heiner Busch in Fa. Deutsche Saatveredelung AG / Dipl.Ing.agr. Hans-Otto Wegener in Fa. DSV - Saatzuchtstation Thüle
DE
4 records
Lemonade
TerminatedSolanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
NL
5 records
Legenda
Application submittedSolanum tuberosum L. · Potato
ShANINA ELENA PETROVNA / KLYuKINA ELIZAVETA MATVEEVNA / RYaZANOV GENNADIJ ALEKSANDROVICh / LEJS VITALIJ NIKOLAEVICh / HOLMANSKIH VERONIKA NIKOLAEVNA / STAFEEVA MARIYa ALEKSANDROVNA / SERGEEVA LYuDMILA BORISOVNA
PL
6 records
Lopex
TerminatedSinapis alba L. · White mustard
P.H. Petersen Saatzucht Lundsgaard GmbH Herrn Asmus Sören Petersen / Michaela Schlathölter
DE
5 records
LD17
ActiveSolanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
FR
4 records
Leonore
ActiveSolanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico B.V.
NL
5 records
Legendairy
ActiveMedicago sativa L. · Alfalfa
Forage Genetics International
PL
3 records
Lansor
ActiveSolanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
NL
5 records
Lea
ActiveSolanum tuberosum L. · Potato
SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4
DE
7 records
Lucas
ActiveRaphanus sativus L. var. oleiformis Pers. · Oil radish
BARENBRUG BELGIUM
BE
4 records
Lifeuil
TerminatedMedicago sativa L. · Alfalfa
Amelioration Fourragere (FR)
FR
4 records
Lili
Application submittedSolanum tuberosum L. · Potato
SVALOF AB
BE
3 records