On Apr 25, 3:06�pm, Tony wrote:
Pat wrote:
"Elmo" wrote in message
...
On Sun, 25 Apr 2010 17:06:15 +0000 (UTC), Elmo wrote:

Mostly, I'm left with huge tangles of poison-oak stems ... so I ask ....
WHERE does weed killer get INTO the plant and how?
This journal article implies only the leaves can uptake the glyphosate ...
both the underside and the upper side ... but HOW do they do that?
http://www.jstor.org/pss/4043711

What is the mechanism of uptake?

Bear in mind, leaves act like a child drinks from a straw ... i.e., water
transpires OUT causing a vacuum which brings water and nutrients in from
the ROOTS ... but glyphosate isn't applied to the roots ... it's applied
to
the leaves.

It's all very confusing ... if the leaves are transpiring OUTWARD, why
would they suck in the wet glyphosate? What's the mechanism to suck INWARD
water from the leaf?

There are better brush killers than roundup. �Brush killers are absorbed
thru the leaves. �They also can be applied to a fresh cut stump in a
concentrated form. �I would be using Garlon instead of roundup. �I would
apply it to the leaves a few days before I cut the plant down. �When I cut
the plant down I might also paint some on the stump. �I would then reapply
it to any regrowth from the roots every few weeks. �The best time to use a
brush killer is when the plant is actively growing in the spring. �I might
also buy a couple of goats to help with the regrowth.

Just thought I'd mention... I had heard applying too much poison can
sometimes make the poison less effective. �I find some things hard to
believe but when it was explained to me I caught on. �Some poisons, like
mentioned, rely on the plant to uptake the poison and spread it
throughout the plant including the roots. �If the poison is mixed too
strong, it kills off the foliage before it has had time to get to the
roots. �The top of the weed dies, then the roots send more foliage back
up again. �Ahh, now I get it! �FWIW- Hide quoted text -

- Show quoted text -

Had some difficult to kill poision ivy on a slope. definetely only
spray leaves

Tried roundup, it just stunted its growth

tried poision ivy killer, again stunted growth.

talked with a landscaper who would only kill the entire slope, there
were long term plantings there I didnt want to kill

came here and got EXCELLENT suggestion

mix roundup 50/50 with poision ivy killer. breaks feds law but it
WORKS

I actually felt bad for the poision ivy, after being so dedicated it
looked bad 12 hours after spraying and was firmly dead in a week.

do note the dead stems etc can still make you itchy

so first let the poision ivy leaf out lushely again.

Then break federal law by mixing the chemicals, and wipe out your
poision ivy patch