Hoping to find some help here. When we first built our house we wanted some quick shade and without doing some research I planted a couple white poplar trees. 20 years later I am fed up with the root system and the suckers that pop up all over our yard. We recently removed the trees using a back hoe and dug up the root ball. My question is, with removing the main roots, will this kill off the remaining roots that have spread across our yard? If not, is there a good way to kill off this system? Wish I had done my research long ago before planting, but live and learn. Thanks in advance.