Valkýra
ActiveSolanum tuberosum L. · Potato
CZ
3 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.
Zitronina
ActiveSolanum lycopersicum L. · Tomato
HU
2 records
Zuza
ActiveSolanum tuberosum L. · Potato
CZ
3 records
Zorba
ActiveBeta vulgaris Sugar Beet Group · Sugar beet
CZ
2 records
Supermarzano
ActiveSolanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
PT
2 records
Ubari
Activehybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
HU
2 records
Tyncanto
ActiveSolanum lycopersicum L. · Tomato
HU
2 records
Veloria Zel
ActiveSolanum lycopersicum L. · Tomato
SK
2 records
Top Golan
ActiveSolanum lycopersicum L. · Tomato
HU
2 records
Top Boker
ActiveSolanum lycopersicum L. · Tomato
HU
2 records
Sorbetto
ActiveSolanum lycopersicum L. · Tomato
IT
2 records
Tomimaru
TerminatedSolanum lycopersicum L. · Tomato
NL
3 records
Solstar
TerminatedSolanum lycopersicum L. · Tomato
NL
2 records
Vladan
Protection expiredSolanum tuberosum L. · Potato
CZ
3 records
Thamin II
ActiveCucumis sativus L. · Cucumber
CY
2 records
Vivace
ActiveSolanum lycopersicum L. · Tomato
HU
2 records
Skelby
ActiveBeta vulgaris Sugar Beet Group · Sugar beet
DK
2 records
Sivinar
ActiveSolanum lycopersicum L. · Tomato
NL
2 records
Tobforta
ActiveSolanum lycopersicum L. · Tomato
HU
2 records
Velox
TerminatedSolanum lycopersicum L. · Tomato
NL
2 records
Tarchon
ActiveSolanum lycopersicum L. · Tomato
CZ
2 records
Sibarita
ActiveSolanum lycopersicum L. · Tomato
HU
2 records
Valy
Protection expiredSolanum tuberosum L. · Potato
CZ
3 records
Sex veckors röd
ActiveSolanum tuberosum L. · Potato
SE
2 records