Iowa State University is to helping preserve the Monarch Butterfly. I found this article which lists the decline in Monarch's as loss of over-wintering habitat and loss of milk weed. It mentions nothing about pesticides or neonicoinoids. At the end of the article is the list of "partners" in the effort.
Now I know why pesticides are not mentioned. Monsanto and DuPont Pioneer are on the list. It's a 3 year old article. I may contact them and see how it's going after 3 years.