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Merlinius brevidens (Allen, 1955) Siddiqi, 1970
Synonyms: Tylenchorhynchus brevidens Allen, 1955
Geocenamus brevidens Brzeski
U.S., Australia, Europe, and South America.
D-rated pests in California.
Merlinius brevidens is an ectoparasite on root hairs and epidermal cells; average feeding time is 11 min.
The nematodes appear to be indiscriminate in their choice of feeding sites, and move rapidly from one site to another.
Grasses, cereals, garlic, alfalfa, potato, peas, pears - Alfalfa in the Davis area and elsewhere in Northern California.
For an extensive list of host plant species and their susceptibility, copy the name
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Male uncommon, probably not essential for reproduction.
Bridge (1970) observed that a female laid 11 eggs over a period of 120 hours while feeding, and the newly hatched juveniles fed on the same root as their parent.
Wet soils shorten survival of M. brevidens; nematode can survive for 1 month in wet soil; 9 months in dry.
Langdon et al. (1961) found that M. brevidens was associated with stunt symptoms in wheat and barley in Oklahoma.
Varo Alcala et al. (1970) reported that this nematode causes increased cellulose thickenings of the external cell walls of the root hypodermis of wheat and barley in Spain.
Nematode feeding may increase susceptibility of barley and wheat to invasion by Olpidium fungus (Langdon et al., 1961).
Yields of no-till annual spring wheat (Triticum aestivum) in eastern Oregon were inversely correlated with population levels of Merlinius (Geocenamus) brevidens. Soil treatment with Aldicarb improved grain yields (Smiley et al., 2006).
Soil fumigation with ethylene dibromide (EDB) decreased the populations of M. brevidens in Californian pear orchards, but there was no evidence to indicate a correlation between the population density of the nematode and pear vigor (Lownsbery et al., 1964).
For a list of plant species or cultivars (if any) reported to be immune or to have some level of resistance to this nematode species, copy the name
select Nemabase Resistance Search and paste the name in the Genus and species box
CIH Descriptions of Plant-parasitic Nematodes, Set 1, No. 8 (1972)
Smiley RW, Whittaker RG, Gourlie JA, Easley SA. 2006. Geocenamus brevidens associated with reduced yield of no-till annual spring wheat in Oregon. Plant Disease 90:885-890.