I'm reaching out regarding the treatment of black swallowwort. Its still in the EDRR stages up here in the U.P., and in my CISMA area we only have one known infestation. We've been helping to treat it for multiple years now, but we're wondering if perhaps we're not using some of the best management practices on it.
My questions are:
1. If you've treated it, what chemical did you find worked best? Or did you find a non-chemical solution worked well, too?
2. What time of year/phenology of the plant did you treat it?
3. Any other advice?
Thanks everyone! Hope you all have a great weekend!