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Killing root ofY ucca

I’ve take out three Yucca tubers but there’s a large lump of root left. How can I kill it without harming surrounding plants please?
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https://www.wilko.com/sbk-tree-stump-killer-250ml/p/0478644?gclid=EAIaIQobChMIsOzVy7SJ-QIVEZftCh2QbQLGEAQYAiABEgJkWvD_BwE&gclsrc=aw.ds
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