Michelef Sounds like you've done a great job reclaiming what the Ivy claimed. I understand 5 acres is a vast area to control. I only post the following as a long shot. I may make a scaled down quantity and see if it does work. I assume it's a US Gallon, 3.785Litres
How to Kill Ivy With Dawn Detergent By Andrea Griffith, eHow Contributor
Ivy can take over almost everything in the garden if not properly maintained. Unfortunately, maintaining ivy is a challenge--ivy can be very difficult to keep in one area without it spreading all over the yard (and the house, garage, plants, and trees). However, with the help of some common household products, tackling your ivy problem can be easier than you'd think. Things You'll Need 1 cup salt 1 gallon of vinegar Stock pot 8 to 10 drops of Dawn Detergent Ladle Funnel Spray bottle Steps 1 of 4 Pour the vinegar into a stock pot and turn the heat to medium. Combine salt with the vinegar. The heat will help dissolve the salt. 2 of 4 Cool the vinegar mixture. After it is cooled, add the Dawn detergent. 3 of 4 Place the funnel on top of the spray bottle. Ladle the vinegar mixture into the spray bottle. Fill the bottle until it's full. 4 of 4 Spray the mixture onto all of the ivy, focusing on both the leaves as well as the ground where the roots lay. Tips & Warnings This mixture will kill other plants and flowers. Make sure to spray the mixture on the ivy only.
