Just found this 1 while searching the net.
It is the 1st I have found mentioning Colorado beetles

You may want to give it a go next season.

All of my potatoes have already been dug this week.


Horseradish Repellent:


This spray is effective on aphids, blister beetles, caterpillars, Colorado beetles, whiteflies and soft-bodied insects.

3 quarts boiling water
2 cups cayenne peppers
1 inch piece horseradish root, chopped
2 cups packed scented geranium leaves, any type, optional

Combine ingredients and let set for 1 hour, cool, strain, and spray.

Note: this can be made without the scented geranium leaves if you don't have them to spare.