I've got a 5L container of 360 g/l glyphosate. This works well for general weedkilling tasks using a spray at a dilution of 50ml in 5L (100:1).
I want to make a paste or gel that I can use to paint on leaves where I can't use a spray. I'm thinking to mix it up with some cheap wallpaper paste.
Does anyone know what dilution I should use for making a paste? I'm guessing it should be stronger than for a spray, but I've heard that if it's too concentrated the plant won't absorb it.
When I did this it (i) went mouldy & (ii) went runny, in pretty short order (a few days), so only make up enough to use at one time.
I made it up at the same concentration as for spraying.
But bear in mind that the gel will probably go onto the leaves more thickly and stay on longer, so may be just as effective, or more so.
If it were me, I'd stick with the 50ml in 5 litres if it already works for you at that strength.
The same or maybe a bit less as you'll put more paste (so more glyphosate) on the leaves than a spray would.
Too high a dose kills the leaves and interferes with the clever bit of getting the plant to spread the glyphosate throughout itself...
Jim K
Yep - glyphosate doesn't work on leaves in stronger concentrations, because it kills the leaf quickly without getting absorbed into the plant.
I had some clumps of thick fast growing grass in the border grass verges around the driveway, which are fine decorative (not hard-wearing) grass. I solved them very effectively by letting the lawn grow for a week so the course grass clumps were taller, spraying some glyphosate onto a disposable glove I was wearing, and running my hand over the lawn so it only touched the taller course grass. Lawns are very sensitive to glyphosate though - even fine drift from elsewhere.
Years ago, I did see a glove for sale which worked this way, already impregnated I think (didn't actually buy it, so not sure quite how it worked).
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