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FW: Freeway flowers, weeds & arboricides

I'm sending this again as I never got the bounce back so it must be
lost.
Sorry if you've already seen it  :-)

> Nick asked if Oxalis pes-caprae is weedy is South Africa,  YES
> It is one of four spp. considered weedy enough to be listed in a neat
> little book called "Problem Plants of South Africa"  There are roughly
> 243 native Oxalis spp. in South Africa with two natives and two
> introductions treated as weeds.
> 
> There are roughly 1100 introduced species in Western Australia that
> have naturalised and many of these are considered serious weeds.  Liz
> was right, I could spent hours going on about it or if you are really
> interested you could buy a copy of our book "Western Weeds, a guide to
> the weeds of Western Australia" 
> Or if you want to wait a while I am converting the book into a web
> site, I'm about 1/3 rd finished and have yet to get the search engine
> working but what I've done so far looks very nice.  I have included
> all the photos and drawings from the book (600+) and all the text.
> Its a slow process as I want it to look like the book, not some auto
> generated database site.
> 
> On the issue of arboricides Tim, many herbicides you could use would
> leave residues in the plant tissue.  Something that could be tested
> for easily, especially if some of this herbicide was found by the
> plant police on your property.
> On the other hand testing for residues is specific and if the testing
> lab isn't told what to test for, then they can't test. Testing is
> expensive and sometimes the results can be open to interpretation,
> some herbicides have quite innocuous breakdown products, others leave
> distinctive chemical residues.  
> We commonly have people bringing in their prize plants all withered
> and dieing quite obviously afflicted by herbicide but we can do
> nothing as in most cases the culprit cannot be linked to the resultant
> damage, it is your tree however and you have asked previously to
> remove it? Talk about establishing a motive   :-( 
> I have used picloram based herbicides to kill large trees, but these
> herbicides are quite residual and I could not grow anything on the
> spot where the tree was for several years (no real problem, a few
> square meters in over 1200).  Any form of stem injection will leave
> marks easily spotted.  Its a problem Tim   
> 
> Cheers, Rod
> 
> 
> Rod Randall
> Weed Risk Assessment
> Weed Science Group, Agriculture Western Australia
> Home Page
> http://www.agric.wa.gov.au/progserv/plants/weeds/Weedsci.htm
> 
>              "I weed..."
>
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