Key to the genera of the family Tylenchidae
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:
Commonly occurring in most soils.
Probably fairly small. Most reports are about occurrence and abundance
rather than documenting any effects on growth.
Ectoparasites of plant roots, root hairs, algae, etc.
Yeates et al. (1993a) described Tylenchus as plant feeders (algal, lichen
(algal or fungal component), or moss feeders that feed by piercing), or
Yeates et al. (1993b): classified Tylenchus
spp. as "plant associated", indicating that they were found in the
rhizospheres of plants.
Tylenchus emarginatus reported to feed and
reproduce as a
migratory ectoparasite on the roots of seven species* of conifer,
but the nematode was unable to feed or reproduce on ten species of soil-borne
fungi** (Thorne, 1961; Gowen, 1970).
* Picea abies, P. glauca, P. mariana, P. rubens, Pinus
banksiana, P. sylvestris, P. resinosa, P. sitchensis
** Cylindrocarpon radicicola, Cylindrocladium scoparium,
Rhizoctonia solani, Trichoderma lignorum, Zygorhynchus moelleri, Chaetomium sp.,
Fusarium sp., Pestolotia sp., Pythium sp., Sporobolomyces sp.
The generation time of T. emarginatus at 25C was 5-6 days. Females did
not produce eggs at temperatures > 30C or <10C. Also eggs produced at
favorable temperatures did not hatch at temperatures >30C or <10C.
Relatively slight, small stylets penetrating only thin cell walls.
On water agar culture, T. emarginatus fed on root epidermal and
root cap cells of sitka spruce (Picea sitchensis) without
affecting root elongation or other obvious damage (Gowen, 1970).
Host Plant Resistance, Non-hosts
Gowen, S.R. 1970. Observations on the fecundity and
longevity of Tylenchus emarginatus on sitka spruce seedlings at different
temperatures. Nematologica 16:267-272.
Thorne, G. (1961), Tylenchinae, chapter 5 in: Principles of Nematology,
McGraw-Hill Book Company Inc., New York - Toronto - London, 553 pp.
Yeates, G.W., Bongers, T., Goede, R.G.M. de, Freckman, D.W., Georgieva, S.S.
(1993a), Feeding habits in soil nematode families and genera - an outline for
soil ecologists, Journal of Nematology, 25 (3): 315-331.
Yeates, G.W., Wardle, D.A., Watson, R.N. (1993b),
Relationships between nematodes, soil microbial biomass and weed-management
strategies in maize and asparagus cropping systems, Soil Biology and
Biochemistry, 25, 869-876.