I think they like Yew.

I can't say I've, honestly, noticed what time the wasps start to die off, but it doesn't seem to be just yet, (This year at any rate).

It rained PISSistantly most of the day, so most of it was spent indoors.
I spend a little time, from time to time, gazing out. One of my gazes spotted numbers of wasps circulating this tree. Funny thing is, I never saw them going for the seeds the same way as they appear to enjoy my plums.