RE: Solved! The mystery of the miraculous insecticidal chalk
- To:
- Subject: RE: Solved! The mystery of the miraculous insecticidal chalk
- From: D* W*
- Date: Fri, 23 Oct 1998 10:07:01 -0700
- Importance: Normal
-----Original Message-----
From: owner-perennials@mallorn.com [owner-perennials@mallorn.com] On
Behalf Of Nan Sterman
Sent: October 22, 1998 10:20 PM
To: medit-plants@ucdavis.edu; perennials@mallorn.com
Subject: Solved! The mystery of the miraculous insecticidal chalk
You might recall a discussion a few months back, when I asked if anyone
knew the identity of the miraculous insecticidal chalk I was using for my
ant problem. <SNIP>
_______
The chalk is a greasy natural alkaline chalk which has been impregnated
with synthetic pyrethrins known as pyrythroids. <SNIP>
Michael D. Barclay, Council, California Horticultural Society
opga@wenet.net Growing 2,000 species fifteen miles from the Golden Gate!
_________________
I'd still like to know the hazards of pyrethroids, but at least we now have
an idea of what we are dealing with. Anyone have any comments?
Nan
Never heard of the chalk before! Thanks. Sounds like a good alternative to
ant traps under the sink! :-)
My one and only organic chemistry class was a long time ago. I remember
pyrethroids as relatively benign. More authoritative info from Florida U at
http://128.227.103.60/txt/fairs/52927
There's a picture of hydro-carbon structures for Permathrin and Fenvalerate
at --
http://www.chem.monash.edu.au/docs/dghewitt/powerpnt/agrichem/sld022.htm
Donna.
(who should be out planting bulbs -- rains come tomorrow!)
---------------------------------------------------------------------
To sign-off this list, send email to majordomo@mallorn.com with the
message text UNSUBSCRIBE PERENNIALS
