My neighbor likes me to spray Lowes glyphosate with surfacant along
buildings and fences. I want it to work fast because she'll get antsy
and want me to use a string trimmer. You can't argue with a woman.
Typically, the effect isn't visible on most plants in 3 days. It's
quite visible in a week. The other day I noticed the brown leaves of
poison ivy I'd sprayed at her place.
At my place, I don't bother to spray poison ivy. It's easier to snip
with hedge shears. If it comes back, I snip again. Glyphosate is good
for the kind of plants that would come back quickly and persistently.
I first used glyphosate on poison ivy about 1983, at the farm. It was a
patch covering hundreds of square feet. Spraying worked fine. When I
sprayed a patch a few years later, I saw no effect after a week. Maybe
it wasn't growing when I sprayed.
I've never had trouble attacking poison ivy with a string trimmer. Maybe
it happens too fast for the plant to bleed.
Same here. I use 50 / 50 glyophosphate with brush killer (usually 2,4D). Mix
both to the highest concentration listed on the label. It still takes a week
before the leaves start to curl and up to a month befor they go brown.
The Enlist system mixes 2,4-D and glyphosate. That's for fields where
weeds could be resistant to either because both had been used extensively.
For poison ivy, I don't see the advantage of mixing. If after a week, I
don't see results, I assume it didn't absorb enough. I spray again.
That didn't seem to work with some Spectracide 2,4-D stuff I got for
buckhorn plantain. Seeing no results after a week, I'd spray again.
There seemed to be fewer after I sprayed, but I didn't know why I never
saw any shriveling or dead plants.
After a couple of years, I quit spraying and began cutting roots with a
sort of forked bayonet. I had to bend over thousands of times, but it's
fun when you get used to it, and it worked.
I haven't seen poison ivy resist repeated spraying.
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