There is some level of toxic that doesn't kill, it harms but theplant (or animal or fungus or whatever) can deal with the poison and live through it all.
And so as you say, he is discussing the level that harms, but doesn't kill a plant.
Roundup is really good at just a little really working over a plant; but it also is only effecting a very short time after application. If it is terrible hot, terrible dry, so the plant is not actively growing;
And if the plant is hardened up by being old, setting seed, waxy, or otherwise so the Roundup doesn't penetrate in to the plant itself;
And if the water used is very hard water, or dirty with clay particles in it, or otherwise poor water;
And of no AMS (only need 3# per acre) and/or surficant (to eat through the wax) is added to some of the cheaper formulations;
Then the plant can deal with the very low dose of Roundup that it gets.
In normal weather, with younger plants, Roundup works so well you can fudge on all that stuff and it still will kill all the grasses.
But this year - the plant might have gotten such a low actual dose into it's veins, it only weakened it, didn't kill it.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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