Waqu
ActiveSolanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
NL
4 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.
Xidejia
ActiveSolanum lycopersicum L. · Tomato
NUNHEMS BEIJING SEEDS CO.
NL
4 records
Vulspot
ActiveSolanum lycopersicum L. · Tomato
Nunhems B.V.
NL
4 records
Villax
ActiveSolanum lycopersicum L. · Tomato
Axia Vegetable Seeds B.V.
NL
3 records
Vigory
ActiveSolanum torvum Sw. · Turkey berry
BLUMEN GROUP S.P.A
IT
2 records
Victorino
TerminatedTriticum aestivum L. · Bread wheat
IRTA/UPM/CSIC/EUROSEMILL.
ES
3 records
Vimeiro
ActiveSolanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
ES
3 records
Violet star
ActiveSolanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
AT
3 records
Vilmara
ActiveSolanum tuberosum L. · Potato
APP Agroresursu un ekonomikas institūts
LV
2 records
Vivat
ActiveSolanum tuberosum L. · Potato
Bavaria Saat GbR
DE
3 records
Veloce
TerminatedSolanum lycopersicum L. · Tomato
Vilmorin-Mikado S.A.S.
FR
2 records
Vistula
ActiveSolanum lycopersicum L. · Tomato
HM Clause Inc (US)
FR
2 records
Vasquel
Application submittedCapsicum annuum L. · Bell pepper
Enza Zaden Beheer B.V.
NL
3 records
Vincitori
Application submittedSolanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
NL
3 records
Vespucci
ActiveSolanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
NL
3 records
Valoasis
ActiveSolanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
4 records
VB Liepa
TerminatedSolanum tuberosum L. · Potato
Lietuvos agrarinių ir miškų mokslų centro Vokės filialas
LT
2 records
Vaiben
ActiveSolanum lycopersicum L. · Tomato
NEZZALEZ, S.L.
ES
2 records
Vivary
ActiveSolanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
4 records
Veronica
ActiveSolanum lycopersicum L. var. lycopersicum · Tomato
S.A.I.S. Societa Agricola Italiana Sementi
IT
2 records
Vitaltop
ActiveAvena strigosa Schreb. · Black oat
DLF Seeds A/S
NL
4 records
Uta
ActiveSolanum tuberosum L. · Potato
Bavaria Saat GbR
DE
3 records
Vitalli
ActiveAvena strigosa Schreb. · Black oat
DLF Seeds A/S
NL
4 records
Vermilenza
ActiveSolanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
NL
2 records