WestNileVirus-L: Re: Characteristics of WNV transmission

From: Richard Lampman <rlampman_at_inhs.uiuc.edu>
Date: October 29 2002

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<div><font face="Times" size="+1" color="#000000"> <u>Culex
restuans</u> may be underrepresented in  dry ice traps (Brust,
R.A., 1990.  Oviposition behavior of natural populations of<u>
Culex tarsalis</u> and<u> Culex restuans</u> (Diptera:Culicidae) in
artificial pools. J. Med. Entomol. 27:248-255.). </font></div>
<div><font face="Times" size="+1" color="#000000"><br></font></div>
<div><font face="Times" size="+1" color="#000000">In gravid traps, the
relative species abundance of Cx. pipiens and Cx. restuans may depend
on the infusion used as bait  (Lampman, R.L. and R.J. Novak,
1996.  Oviposition preference of<u> Culex pipiens</u> and<u>
Culex restuans</u> for infusion-baited traps. J. Am. Mosq. Control
Assoc. 12:23-32).</font></div>
<div><br></div>
<div>We had considerable success with Ae. albopictus in gravid traps
(<font face="Times" size="+1" color="#000000">Lampman, R.L. and R.J.
Novak, 1996.  Attraction of<u> Aedes albopictus</u> adults to sod
infusion. J. Am. Mosq. Control Assoc. 12:119-124).</font></div>
<div><br></div>
<div>Our pools of Culex from this year are scheduled to be analyzed
later to determine whether they were a mixture of
rest.-pips-sals.</div>
<div><br></div>
<div>Rich</div>
<div><br></div>
<div><br></div>
<blockquote type="cite" cite>I do combinations of landing, CDC trap,
and gravid trap collections in<br>
Delaware.  There are spectacular differences in these
species.<br>
Salinarius is always under-represented in gravid traps.  Restuans
is<br>
possibly over-represented in Culex gravid traps, although this is<br>
difficult to tell since it does not land or feed on people (in our<br>
experience).  Pipiens in this year of drought was quite scarce,
although<br>
in our more coastal areas, salinarius had a very good year. <br>
<br>
So, how to explain our spectacular rise in numbers of infected birds
if<br>
pipiens is the major vector?  I think salinarius is involved, but
there<br>
may be more to it than that.  Studies of albopictus feeding
behavior on<br>
birds is still an outstanding issue, unless other people know more
about<br>
this than I do.<br>
<br>
Jack Gingrich, ph.D.<br>
Dept. of Entomology</blockquote>
<blockquote type="cite" cite>Univerisity of Delaware<br>
</blockquote>
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Received on Tue Oct 29 17:51:27 2002