A bit difficult but pulling them up by the roots is the best method of control for any plant you consider a "weed".
The flower of Queen Annes Lace is a food source for many of the predator insects out there.

Like what, kimmsr? Which predator insects feed on Queen Anne's Lace flowers?

rhizo, this is one, of many, easily available web sites that lists which insects use Queen Annes Lace as a food source.

Here is a link that might be useful: Queen Annes Lace feeders

You misspoke, dear Kimmsr. You said, "The flower of Queen Annes [sic] Lace is a food source for many of the predator insects out there."

I am fully aware of phytophagous insects that feed on this plant. No predatory insects are likely to feed on the flower or any other plant part.

Just wanting to be more accurate for coaks22 and wondering if you had some secret information. ;-)

I guess you meant, but didn't say, that Queen Anne's Lace can attract predatory insects to feed on the insects that feed on the flowers. But, frankly, it does a second rate job at that. The fact that is ranked as a noxious weed all across the country is pretty significant.

Coaks22, to answer your question...there really isn't a good method of control over this weed in your pachysandra other than hand pulling. Since it is a biennial, you might gain the upper hand with the judicious use of a pre-emergent herbicide, but I suggest you research that avenue before thinking about it. Successful herbicide use requires education, planning, and preparation.

I'll bet that your local Cornell Extension office would be of some good help with this problem. I vividly remember Queen Anne's Lace growing like crazy all over the place, from my childhood days in central NY state.

rhizo, I have seen Lady Beetles, Green Lacewings, and many other predators on the Queen Annes Lace flower head feeding on the nectar produced, as have several other people I know that study insects. Some of us also know that where Queen Annes Lace is prevelant there is a higher population of predatory insects then where there is none.