A tip I recently learned... Round Up Poison Ivy & Brush Killer has 2 active ingredients, 1 of which is the same as in regular Round Up (I don't have the labels in front of me, so you'll have to look up the actual names). You can get the OTHER ingredient separately (may have to look at Southern States, Tractor Supply, etc)... it will kill the poison ivy WITHOUT killing your grasses & perennials.
For those with birds who have thoughtlessly seeded poison ivy throughout their lawn or garden beds, this could be extremely useful.