Becuase the roots can spread out 50-80ft from the tree, it is advised to cut the stump as low to the ground as possible. Black Walnuts are know for resprouting, using a product with the active ingredient Glyphosate is going to be your best option. Using Roundup QuickPRO which has Diquat as 1 of the 2 ingredients works for a faster knockdown and aborbs throughout the root system better. Below is a step by step guide on how to ensure the saplings won't regerminate.
Step 1 - Space cuts around the trunk of a mature tree, using a hatchet. These cuts should go down at an angle, exposing some inner flesh of the trunk. Alternatively, cut a straight line around the trunk, removing the bark along the line. For saplings, there's no need to remove bark because the young bark is thin.
Crossbow Herbicide will become rainfast in 4-6 hours after application but it would be recommended to apply when no rain is forecasted within 24 hours.
Crossbow is not actually labeled to control English Ivy. The best thing would be a glyphosate based product like Roundup QuikPro to spot treat. Care should be taken to avoid desirable plants as it can harm them as well.
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Asiatic/Oriental Bittersweet is an invasive species and difficult to eradicate and control. We recommend that you speak to the manufacturer Dow AgroSciences for information on treating with Crossbow as it is not listed on the label. They can be reached at 800.992.5594. We also suggest speaking to a Master Gardener in your area by clicking the link below for more treatment advice.
http://www.ahs.org/gardening-resources/master-gardeners