For the Life on the Japanese Knotweed study. There was a distinct dearth of life on these relatively young sprouts, as it happens. Come to think of it, I think that's what I found last year 1 or 2 times when I found a patch & went looking. Is that the general pattern -- one of the problems is that nothing eats it (or otherwise interacts)? Anyway, I did find this pair of ants. If anyone can pin down their ID further, I'm sure it would be greatly appreciated.