I don't know why she swallowed a fly

From the BBC:

Since Japanese knotweed was introduced to the UK it has rapidly spread, and the plant currently costs over £150m a year to control and clear.

But scientists say a natural predator in the weed's native home of Japan could also help to control it here.

The insect will initially be released in a handful of sites this spring.

I'm confident these beneficent bugs will rid of us of the nasty knotweed quicker than you can say 'Cane Toad'. This time will be different.