I have gotten alot of valuable info from Scott Persons Ginseng Manual. And in his book he list a web site for the British Columbia Ginseng Growers Manual. This online manual as been very helpful to me for identifying and treating diseases of my own ginseng plants. Here is the website.
Another site that Scott Persons lists is the Ginseng Crop Updates from Ontario Canada.
For some reason the Crop Updates website above is wrong. take out the two dashes in the scripts section of the web address.
This last site talks about various problems with ginseng like diseases and heat stress with excellent photos of those problems with ginseng.
I have used all three of these resources many times for my Wild simulated Ginseng.
Hope this info is helpful to others.