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#16
30-07-2007, 02:13 PM
posted to uk.rec.gardening
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Cure for Knotweed?
In article ,
"CWatters" wrote: "K" wrote in message ... writes Since glyphosate is taken up by the plant and interferes with the metabolic process, and needs to travel throughout the plant to be fully effective, the logic and experience of others here is that applying in more concentrated form lessens its effectiveness -- Kay Ah thanks for that. I did wonder if making it too strong was just a waste. It's not cheap. Firstly, Knotweed eradication is possible. This is what we did to a stand about 2.5metres tall 5 metres long by 3 metres. That is a substantial clump. In autumn, just before the weed was beginning to die back for the winter we cut it to the ground, leaving about 5 cm stems protruding. We poured glyphosate into these - made up to the strongest recommended dilution. We added food dye so that we could see which stumps had been treated at a glance. The glyphosate was mixed up and dispensed into the stems using a large syringe - without a needle. The material we cut was fairly carefully built into a sort of stook or rick with most of the stems horizontal and some verticals pushed through to hold it together. After a couple of weeks the whole mass had dried out sufficiently and it was burnt on the site so there were no disposal problems. Next spring it was clear that, while it wasn't completely dead, it was extremely sick. A few straggly stems come up. Every time we see a leaf it gets painted with glyphosate solution, weather permitting. We're expecting to have to monitor the site for at least two seasons more but basically it is dying fast and it hasn't had a chance to build its stored food this season. We've two more similar sized clumps to do this autumn. |
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