Quote:
Originally Posted by R Leo
In the last couple of years, I've sprayed a few gallons of glyphosate and always have the same moment of doubt when nothing seems to be happening.
Because it disrupts the plant's ability to produce amino acids, efficacy of glyphosate herbicides (ie RoundUp) depends largely on the amount of sunlight and the rate of plant growth. If you mixed and applied it properly, you generally see results in 7-10 days.
Possibly so on large, broadleaf plants in a growth cycle. Grasses and other kinds of weeds take longer.
For selective control of noxious plants, I've rigged a wick-type applicator so that I can place roundup directly on the plant's leaves..time consuming but, I con't have to worry about killing the grass around undesirable plants.
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Perfect, R Leo.
Another useful thing one can do is add a tiny amount of detergent to the sprayer. I know, I know: Round-Up already has a surfactant. But if you hit something with a heavy cuticle like Portulaca, Sedum or Euphorbia; or something very hairy like Cnidosculum (bull-nettle), etc, the normal glyphosphate & surfactant just isn't we enough to reach into the stomata -- the easiest point of entry for the herbicide. Put a couple of ml's of detergent per liter and you'll have some sticky herbicide that will kill dang=near any plant it touches.
Oh yeah, DO NOT use glyphosphate anywhere near your tomatoes. They are especially sensitive to it. Best time to apply is late evening. Glyphosphate is photoreactive and so quickly breaks down in sunlight. Apply it overnight and it stays liquid longer, which enhances it's translocation and without sunlight, it will last longer.