"Timothy Murphy" a écrit dans le message de
...
David in Normandy wrote:

Just don't buy Roundup or pre-diluted "read to use" glyphosate as you
will be paying something like ten times the price (per unit) as the
generic concentrate.

Where do you get the generic concentrate?
I haven't seen it on sale in any garden centre.

In supermarkets in (at least rural areas) sunny .fr

The active principle is formulated with excipients to aid wetting and to
open the stomata so the product is properly absorbed.

For deep-rooted plants it's best to use a high dilution, so the stuff has
time to get to the roots before the top growth is killed off. It may take
two goes.



--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

In article , Martin Brown
writes
Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste


Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.
--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk

On Sat, 23 Oct 2010 22:15:45 +0100, Janet Tweedy
wrote:

In article , Martin Brown
writes
Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste


Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.

But in September, not now. Now is surely too late.

Pam in Bristol

"Pam Moore" wrote in message
...
Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste


Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.

But in September, not now. Now is surely too late.


Probably.

I have always considered that the take up would be more effective on most
stuff, when it is growing
at it's most vigorous - late spring to early summer.

Regards
Pete
www.thecanalshop.com

On Sun, 24 Oct 2010 11:32:50 +0100, "Pete"
wrote:



"Pam Moore" wrote in message
.. .
Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste


Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.

But in September, not now. Now is surely too late.


Probably.

I have always considered that the take up would be more effective on most
stuff, when it is growing
at it's most vigorous - late spring to early summer.

"THEY" say that the plant draws the poison down into its roots at the
end of the season.

Pam in Bristol

On 24/10/2010 11:40, Pam Moore wrote:
On Sun, 24 Oct 2010 11:32:50 +0100, "Pete"
wrote:

"Pam wrote in message
...
Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste

Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.

But in September, not now. Now is surely too late.

Probably.

My feeling too. I don't know if autumn is the optimum time to hit the
more stubborn weeds or not. I am not convinced by the argument as
glyphosate is a potent traslocating weedkiller anyway. Letting these
vigourous plants grow unmolested all summer long strikes me as a great
way to have them bulk up their underground storage rhizomes ernormously.

I have always considered that the take up would be more effective on most
stuff, when it is growing
at it's most vigorous - late spring to early summer.

"THEY" say that the plant draws the poison down into its roots at the
end of the season.

I think it is questionable at best. There might be some advantage to
hitting it again before the first frost so that the plant doesn't get
the chance to move all the sugars from the top growth into the roots.

There seems to be a marginal advantage (cost wise and effectiveness) in
using a slightly more dilute hit on stubborn weeds than the label
suggests. That gives a bit more time for translocation before the tops die.

But AFAICT never allowing it to see the light without getting hit by
whatever weedkiller you happen to be using is as good as anything.

Regards,
Martin Brown

Pam Moore wrote:
On Sun, 24 Oct 2010 11:32:50 +0100, "Pete"
wrote:


"Pam Moore" wrote in message
...
Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste

Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.
But in September, not now. Now is surely too late.

Probably.

I have always considered that the take up would be more effective on most
stuff, when it is growing
at it's most vigorous - late spring to early summer.

"THEY" say that the plant draws the poison down into its roots at the
end of the season.

*THEY* may be right, but my course of action would be to spray as soon
as there is leaf, leave it standing for ten days, cut it down and repeat
until autumn, then spray and leave the growth standing until it is good
and dead.

Repeat the following year if necessary.

'm just about to pick some nettle tops which have reappeared after most
of the roots were pulled-up. Glad I didn't spray them (as intended) 'cos
I do like nettles as a veg.

--
Rusty

In article , Pam Moore
writes
Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.

But in September, not now. Now is surely too late.

Pam in Bristol

I've got weeds that are only just dying down Pam!

--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk

On 23 Oct, 22:15, Janet Tweedy wrote:
In article , Martin Brown
writes

Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste

Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.
--
Janet Tweedy
Dalmatian Telegraphhttp://www.lancedal.demon.co.uk

There is the alternative that you never hear of now which is to mix
the concentrate with parafin. Penetrates a lot better.

"Janet Tweedy" wrote in message
...
..

But in September, not now. Now is surely too late.

Pam in Bristol

I've got weeds that are only just dying down Pam!


Lucky you - I have many that are living up and thriving - including nettles
and docks !

Regards
Pete
www.thecanalshop.com

Janet wrote:
In article f736284e-2ca4-4c2a-9455-a5e3a9ca7581
@k22g2000yqh.googlegroups.com, says...
On 23 Oct, 22:15, Janet Tweedy wrote:
In article , Martin Brown
writes

Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste
Many of the more stubborn weeds inc. Japanese Knotweed are considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.
--
Janet Tweedy
Dalmatian Telegraphhttp://www.lancedal.demon.co.uk
There is the alternative that you never hear of now which is to mix
the concentrate with parafin. Penetrates a lot better.

I've only heard that in relation to woody stump killers which iirc
are not glyphosate.

Glyphosate weedkillers are applied to growing green leaf and
translocated from leaves to roots; it's hard to see how adding oil would
increase leaf absorption.

It won't AFAIK - washing-up liquid often helps with glossy/waxy-leaved
plants such as ivy, and ISTR it being suggested for ground elder and
Japanese knotweed

--
Rusty

In article
,
harry writes
There is the alternative that you never hear of now which is to mix
the concentrate with parafin. Penetrates a lot better.


Would that work on ground elder and ivy? If so I'll give it a try and if
it doesn't work presumably you can set light to them
--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk

"Janet Tweedy" wrote in message
...
In article
, harry
writes
There is the alternative that you never hear of now which is to mix
the concentrate with parafin. Penetrates a lot better.


Would that work on ground elder and ivy? If so I'll give it a try and if
it doesn't work presumably you can set light to them



The recommended ratio of paraffin to mix would hardly be enough to create
an inflammable liquid.
Perhaps the later idea of a squirt or two of Fairy( or sim. ) to the mix,
would aid penetration similarly.

Regards
Pete
www.thecanalshop.com

On 24/10/2010 17:45, Rusty Hinge wrote:
Janet wrote:
In article f736284e-2ca4-4c2a-9455-a5e3a9ca7581
@k22g2000yqh.googlegroups.com, says...
On 23 Oct, 22:15, Janet Tweedy wrote:
In article , Martin Brown
writes

Why buy it now? The weather is already too cold for it to have a full
effect - applied at this time of year is a waste
Many of the more stubborn weeds inc. Japanese Knotweed are
considered to
be more likely to be affected by poison if sprayed as they are winding
down for the year as they take the stuff into the roots.
--
Janet Tweedy
Dalmatian Telegraphhttp://www.lancedal.demon.co.uk
There is the alternative that you never hear of now which is to mix
the concentrate with parafin. Penetrates a lot better.

I've only heard that in relation to woody stump killers which iirc are
not glyphosate.

Glyphosate weedkillers are applied to growing green leaf and
translocated from leaves to roots; it's hard to see how adding oil
would increase leaf absorption.

It won't AFAIK - washing-up liquid often helps with glossy/waxy-leaved
plants such as ivy, and ISTR it being suggested for ground elder and
Japanese knotweed

That also sounds like an urban legend since the commercial formulations
already contain far more powerful and noxious surfactants. It doesn't
touch ivy seedlings though which are notable survivors.

The handful of idiot deaths from glyphosate weedkillers are due to the
surfactant toxicity and not the active ingredient!

Ground elder gives up the ghost pretty easily you just have to keep at
it. Never letting the plant see the sun is the key.

Regards,
Martin Brown

Martin Brown wrote:

Ground elder gives up the ghost pretty easily you just have to keep at
it. Never letting the plant see the sun is the key.

What I want is a *BIG* container - six feet across or more, so I can
grow ground elder without it spreading everywhere.

And another one six feet deep so I can grow horseradish without it
digging its toes in for evermore...

--
Rusty