(de Man, 1876) Micoletzky, 1922
Nematode is 4.5-6.4 mm long.
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:
Temperate regions; Britain, Europe, Canada, New Zealand, and U.S.
D-rated pests in California.
Ectoparasite on roots.
Strawberry, rye grass, carrots, peppermint.
Nematode prefers coarse, well-drained soils.
Feeding causes galling of root tips and stunting of root system.
Photographs from Griffiths and Robertson (1984)
On Strawberry cultivar Redgauntlet on sandy soil in England, root growth
was severely reduced, generally necrotic compared to healthy plants and
lateral roots were short and swollen. Population levels in severely
damaged areas were 10 nematodes per 10g soil. In the Netherlands,
Seinhorst reported a tolerance limit of 1-5 individuals per 10 g soil on
strawberry. In Scotland the concern is virus transmission rather
than direct damage by the nematode (Graham and Flegg, 1968).
L. elongatus transmits raspberry ringspot and tomato blackring
L. leptocephalus, L. attenuatus, L. elongatus, Trichodorus
spp. and viruses are involved in Docking Disorder of sugarbeets (named for
Docking region in south of England); virus is carried on the inner surface of
the stylet guiding sheath.
Stunted growth in spring due to nematode feeding; virus symptoms in
foliage. Effects are most pronounced in spring, heavy rainfall in May
seems to increase the problem. In July the affected plants start to grow again
and may achieve almost normal foliage, but a much reduced tap root.
The severity of Docking Disorder varies from year to year with the climate.
Management of Docking Disorder by rotation is difficult as several nematode
species are involved, each with a differing host range. Also host ranges
of these nematodes are not completely known. Efficient rotation might be
worked out on a local base according to the species present, but the prospects
are not favorable because most of the species present are polyphagous.
Host Plant Resistance, Non-hosts and Crop Rotation alternatives:
(1,3-D) nematicide (400 lb/acre or 50 lb/acre on peppermint) applied
in the plant row prior to planting reduces the nematode populations and
increases yield, but only in well-drained alkaline soils. The treatment is
not always effective at economically feasible rates (need high-value crops for
CIH Descriptions of Plant-parasitic Nematodes,
Set 2, No. 30 (1973)
Graham, C.W. and Flegg, J.M. 1968. Longidorus elongatus (de Man) Thorne &
Swanger on strawberry (cultivar Redgauntlet). Plant Pathology 17:191.
Griffiths, B.S. and W.M. Robertson. 1984. Morphological and histochemical
changes occurring during the lifespan of root-tip galls on Lolium perenne
induced by Longidorus elongatus. J. Nematology 16:223-229.