Arthropods are one of the most concerning threats in poultry
industries due to both direct and indirect pathogenic effects. One
of the most important arthropods affecting poultry production is in
the genus Dermanyssus (Acari: Dermanyssidae) with Dermanyssus
gallinae (De Geer) the most important (Fletcher and Axtell 1991;
Maurer and Baumga rtner 1992). Dermanyssus gallinae, also known as
'poultry red mite' or 'red mite' is a direct pest
becauseitisanobligatoryblood-suckingparasite;itisonthebirdonlytofeedfor30-60
min and to spend the rest of the time concealed in cracks and
crevices or in the litter. Its eggs are laid in the hiding places
and hatch into six-legged larvae in 2-3 days. The chicken mite is
seldom seen on the birds because of its intermittent feeding at
night but skin lesions (especially on the breast and lower legs)
are evidence of the feeding (Baker 1999).
InEurope,D.gallinaeisoneofthemajorproblemsinlayingcagedhensandlessinbroiler
industries (Chauve 1998) due to the longer productive cycle related
to the former mana-
ment.Theprevalenceofinfestedfarmsrangesfrom60%inUK(Guyetal.2004;Fiddesetal.
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