TNhunter you are quite rite,i noticed some in the wild seng as you said,it has never seemed to bother the wild seng here,all these pictures are wild seng here,very interesting indeed.
Not sure if you noticed it but I can see \"yellow spots\" on most of the seng leaves that you posted on this thread.
Probably a bit of \"alternaria blight\" going on there.
I had some of that show up on my seedlings this year (first saw it around first of June) and have also found some wild plants while scouting that had the yellow spots.
Looks like I am not the only one seeing that showing up on some seng this year.
I have pics of some nice old wild seng that I took last year that also has the yellow spots. It seems like they do survive and grow and mature even though the leaves do get spotted at times.