Forner Alcaide 418
ActiveCitrus L. · Citrus
Juan Bautista Forner Valero^^^Antonio Alcaide Pérez
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.
Forner Alcaide 517
ActiveCitrus L. · Citrus
IVIA
C-310
ActiveGossypium hirsutum L. · Upland cotton
COKER PEDIGREED SEED CO.
ES
3 records
Agria
ActiveSolanum tuberosum L. · Potato
AT
BE
BG
CZ
DE
DK
+15
38 records
Remarka
ActiveSolanum tuberosum L. · Potato
AT
BE
BG
CZ
DE
DK
+13
38 records
Impala
ActiveSolanum tuberosum L. · Potato
AT
BE
BG
CZ
DE
DK
+11
27 records
Ditta
ActiveSolanum tuberosum L. · Potato
AT
CZ
DE
DK
EE
ES
+6
28 records
Fianna
ActiveSolanum tuberosum L. · Potato
EE
HR
IE
LV
NL
PL
+1
20 records
Montana
ActiveSolanum tuberosum L. · Potato
DE
HR
NL
17 records
Milka
Protection expiredTrifolium repens L. · White clover
CZ
DK
ES
HR
IT
SE
+2
10 records
Cilena
ActiveSolanum tuberosum L. · Potato
DE
FR
IT
LU
NL
8 records
Majestic
ActiveSolanum tuberosum L. · Potato
HR
IT
NL
SI
6 records
Pajbjerg milka
ActiveTrifolium repens L. · White clover
HR
IE
SI
6 records
Dombello
Protection expiredSolanum lycopersicum L. · Tomato
HR
NL
PL
SI
5 records
Urgenta
Protection expiredSolanum tuberosum L. · Potato
DK
FR
HR
7 records
Yumir
ActivePrunus L. · Plum
DE
IT
NL
5 records
Elkana
ActiveSolanum tuberosum L. · Potato
DE
LV
NL
4 records
Monika
Protection expiredSolanum lycopersicum L. · Tomato
CZ
NL
SK
4 records
Marfa
Protection expiredSolanum lycopersicum L. · Tomato
BG
CZ
SK
4 records
Respect
ActiveRaphanus sativus L. var. oleiformis Pers. · Oil radish
DE
NL
6 records
VANESSA
ActiveSolanum tuberosum L. · Potato
FR
IE
6 records
Evergreen
ActiveRaphanus sativus L. var. oleiformis Pers. · Oil radish
DE
NL
6 records
Katahdin
Application submittedSolanum tuberosum L. · Potato
DK
NL
5 records
Adam
ActiveRaphanus sativus L. var. oleiformis Pers. · Oil radish
DE
NL
6 records