Thanks for writing. Those long roots with shoots that come up out of them are called suckers --- and unfortunately, there's not really any good way to stop the tree from producing them. You can keep mowing them as they grow --- or cover the area with landscaping fabric and mulch to stop them before they can reach the light.
Sorry I don't have a better answer for you --- this is a question that there's not really a good solution for.
---Justin, Senior Garden Editor, BHG.com "
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