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Sv: Aquatic Plants Digest V3 #1315

< Date: Thu, 07 Oct 1999 03:43:22 -0700
< From: Steve Pushak <teban at powersonic_bc.ca>
< Subject: pesticide and herbicide persistence in soils
< I'm curious about the possibility of the persistence of insecticide and
< herbicides in garden soil which we might be collecting and using for
< growing aquatic plants. Some of these toxins are highly poisonous to
< fish. How long can they remain toxic? Do they break down rapidly after a
< few months? I have fruit trees in my back yard and I'm curious if the
< previous owner used insecticides like Malathion. Does anybody know how
< persistent it is?
<- --
< Steve Pushak                              Vancouver, BC, CANADA

Hello Steve and others.

I donīt know much about this.
But I read the newspapers ( the better ones ) And to our government and to
us it seems to be a problem
that the ****cides do NOT degrade as fast as the manufactors claim.
In many cases it is a question of what environtment they meet.
In some cases it takes 10 - 100 - 1000 years for
contamination to reach our water supplies. DDT which was banned 10 -20 years
ago is still found.
And RoundUP (Montesano?) that is ensured ( by manufactor) not to reach our
drinking water supplies, is found traces of. Mercury, lead, Plastic
softeners, pesticides, herbicides, hormones and antibiotics in animals for
food...... are documented to influence our health. In a place in our town
was some 25 years ago a factory. The area is still not recommended for
gardening or for kindergardens.
A personal experience: a few years ago I bought some "clay for decoration".
Pure clay, said the declaration.Made some small balls with Master Grow and
let them dry, and inserted into the gravel near the roots.I and 2 of my
friends observed much lessened growth of the plants involved, but we donīt
know the reason. The M. G. is OK, we know, so....
The issue is so complicated.

ole.t at larsen_dk