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I am planning to eradicate a stand of Japanese knotweed by injection of imazapyr. This bamboo-like plant develops a rhizome system far below the ground and the only way to kill it is allow it to absorb a herbicide into the rhizomes.

The problem is that there are two basic approaches. One approach is to cut off the stalks, then inject the herbicide into the resulting cup-like cavity. The other approach is to use a syringe to inject the herbicide into the stalk without cutting it first.

Which approach will be more effective in ensuring that the herbicide reaches the rhizomes?

marked as duplicate by Niall C. Dec 13 '16 at 6:34

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migrated from biology.stackexchange.com Dec 13 '16 at 5:32

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  • I'm voting to close this question as off-topic because weed control is not in the purview of this site. Ask at Gardening & Landscaping instead, or do your own study and try both methods on separate plants. – MattDMo Dec 12 '16 at 20:25
  • @MattDMo It's a biological question. Just because the question has a practical application does not mean it is not about biology. I want to understand how imazapyr is absorbed in this kind of plant and what conditions are conducive for the toxin to reach the rhizomes of the plant. That is a biology problem. – Andre Lenotre Dec 12 '16 at 20:32
  • @ImprisonedRhesus It is a "biological" question but it is a better fit at Gardening & Landscaping. If your question was more about the actual physiology and molecular mechanism then this question would have been a better fit here. Your question is more about how to effectively use the herbicide and that is a matter of gardening practice. – WYSIWYG Dec 13 '16 at 5:29