Rosemary Problem

My rosemary has the fuzzies; erm, let me 'splain . . .

It isn't warm enough in the winter here (SW Ohio) to grow rosemary
outdoors all year, but I like to cook with it and a few other fresh
herbs, so I try to keep a few pots going in the window for culinary
purposes. The problem is, nearly always some sort of disease attacks
one or all. One year it was those pesky white flies. This year, it's
fuzzies on the rosemary.

My current pot of rosemary started being overcome by  some sort of
white-ish fuzz soon after I bought it, which was about 3 weeks ago.
The herbs sit on a window sill in a tray of water which is topped up
pretty regularly.  Any idea if this is mould, a fungus of some sort,
or a web-slinging mite of some kind? 

I've got a pyrethrin spray here, and some malathion--I hate using
stuff like this though. My first thought was to harden it off outside
for a while to see if that cured it.

Would a vigorous wash help? Maybe a wash and a bit of sun?

Currently it's sitting in an east-facing window, in a kitchen with
only one small-ish window. However, I do keep 4 full-spectrum
flourescents burning most of the time in there to ward off SAD and
keep the kitchen plants from croaking--it's a pretty dark room
otherwise. Our spring's been pretty overcast and wet so far too,
averaging about 69 degrees. Also, I tend to keep the hygrometer in the
house reading 40-50% because of having string instruments in the
house.

 That's about all I can think of at the moment to help clue you in to
current conditions here . . . any ideas what's up and what I can do
about it? So far the thyme is unaffected.

Melis

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