On Apr 26, 8:18*am, " wrote:
On Apr 26, 8:12 am, "
wrote:
Elmo wrote:
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?
Same reason your fingers get all white and wrinkly when you soak them in
water...transpiration isn't the only process goin' on. Moisture on the
leaves is more accessible, I suppose, so it crosses cell membranes more
quickly than the moisture coming from the roots. The chemicals in
herbicides might do so more quickly...- Hide quoted text -
- Show quoted text -
Miracle grow fertilizer advertises it feeds thru the roots and leaves.
All herbicides say on the label dont mix. But I can assure you 50%
roundup 50% poision ivy KILLS poision ivy 100% effectively.
It will look BAD within hours
- Hide quoted text -
- Show quoted text -
Couple of points to agree with and add. First, while Roundup can be
used to kill poison ivy, it's not the best choice. Look for products
labeled as brush killer. Another important factor is some of the
products available will not only kill existing vegetation, but also
prevent anything growing back for 4-6 months.
Second, if you use Roundup a lot, buying it at the big box stores or
local garden center is a big mistake. The absolute most expensive
choice is buying it pre-mixed. But even the concentrated mixes are
very expensive compared to what you can find online. A few years
back, I bought 2.5 gallons of Razor, which is glyphosate, same main
ingredient as Roundup, about 50% strength, for maybe $90 online.
You'd have spent several times that buying Roundup in any form at the
usual shops. None of the places I looked have even the concentrate at
anywhere near 50%.