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Glpyhosate would achieve everything you need, but may need two doses - or a stronger than usual mix.
You could try using 2-4D (E.g. Depitox) which would leave any grass at the site clean.
Personally for the risk reasons you state (Carp worth thousands) I would spray with Glyphosate but tell the client a follow visit is needed in 2-4 weeks to finish off any plants which have survived the first spraying. I know Creeping thistle has a habbit of responding to Glpho with lots of new shoots from the root system, these are weak and easily finished off.
2-4-d could be used in much the same way, But If I remember correctly (someone please correct if wrong) It has a longer half life in water, and I am not sure if it is less dangerous to aquatic life than Glyphosate.
If it was me i would go over it with a brushcutter first then come back about 10-14 days later when the new growth has emerged and spray it with glyph, that way one treatment should do it and the dead vegetation should be small enough to rot down in a few weeks.
Talk to Stu @ Cedar Gardening (here on LJN) he has ownership of a fisheries so maybe very up to date with solutions etc.
p.s. Timbrel gets removed from shelves for purchase on 1 Nov 2012 and can not be used after (..I think...) 1st April 2013. Another one bites the dust......
Seems to be a week for Pesticide topics..;-)
Thanks guys all advice gratefully received and noted!
I would use SBK Small Brushwood Killer, as Gary rightly says a PA6AW (w = water) the new course might be worth taking as you will be going back again to this site.....
Thanks Andrew, must admit didn't realise there was a PA6 W. Will have to check out the details.
SBK goes with timbrel in november I belive - it is basically the same stuff with different branding (Active chemical is Triclopyr).
Andrew Knight said:
PA6AW is not a new course, it has always been available although unfortunately most training providers do not tell you about it. When you take a PA6 course it is always worth asking for a PA6AW as when the new pesticides legislation kicks in there is an especial requirement to look after "aquatic" areas.
When I offer PA6 training it takes me an extra 15 minutes on the end of my normal training course, because I emphasise water protection throughout PA1 and PA6 training anyway. The PA6AW test takes the examiner only a short time longer because he or she only has to ask a few more verbal questions and a PA6AW test costs the same as a PA6A test.