The family Trichodoridae was established by Thorne in 1935 but it
remained of limited taxonomie interest until 1951 when Christie and
Perry associated Trichodorus christie (now Paratrichodorus minor)
with a "stubby root disease" that affected certain crops in
Florida, USA and interest further increased from 1960 when P.
pachydermus was implicated as a vector of the economically
important tobacco raule virus. Such discoveries gave an impetus to
studies on many aspects of the biology of trichodorid nematodes
with a consequent proliferation of new species described from
different parts of the world. The number of species increased from
twelve in 1957 to a present day total exceeding eighty. This rapid
expansion in the number of species was accompanied by several
reappraisals of the taxonomy and systematies of the family, the
most notable changes being the creation of the genus
Paratrichodorus by Siddiqi in 1974 and the recognition of the
monodelphic genera Monotrichodorus and Allotrichodorus respectively
by Andrassy in 1976 and Rodriguez-M, Sher and Siddiqi in 1978.
Reliable and unambiguous identification of taxa is dependent on the
known reliability of a range of characters, whieh remains of
paramount importance in taxonomy even when biochemical and
molecular methodology is available. In this book each of the
species, including synonyms and species inquirenda, that comprise
the family Trichodoridae is re-described from meticulous
mieroscopie examination of type specimens, material from official
nematode collections and populations in the field.
General
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