On 02/11/2012 15:50, Timothy Murphy wrote:
The Original Jake wrote:

I put Roundup on a big patch of weeds about 1 week ago,
but they are not dead yet.
Can I pull up the weeds now without losing the effect?

There will probably not be any effect. Roundup has added agents
(compared to pure Glyphosate) which speed up the effect of the
herbicide (these additions are one reason why many don't use Roundup)
and you will see results often within 24 hours or less. But Roundup
still needs drier weather than we've been having and the weeds need to
be actively growing. Mid-late September is generally the latest time
to apply.

Thanks for the advice.
There has been no noticeable affect so far,

If it was glyphosate used correctly then you shouldn't actually see much
happening until two weeks have elapsed unless it is very warm. First
signs are that the growing tips go yellow after a week. Stone dead and
yellow orange after 3-4 weeks. Characteristic appearance.

so I guess your and others' warning that I was too late
are almost certainly true.

It should say on the instructions "use only when in active growth".
Most things now are shedding leaves.

--
Regards,
Martin Brown