DSV arrived on a corner of our farm about 15 years ago. If I had known then what I know now I would have napalmed it, as someone suggests.

We don't use pesticides but regular mowing on flat areas and the weed-whacker on rougher ground is starting to make a difference. I bush-hog where I can but there's lots that gets missed. DSV grows up the fences and trees, up to 8 feet in places, maybe more. It chokes out everything else.

An experimental project involving a moth from the Ukraine (Hypena opulenta) has been introduced in two test areas in Ontario. Researchers are optimistic that the population of these caterpillars will eventually increase to a level where they become effective. That could take a decade or more.