Bill,
I don't have any specific recommendations as I've only dealt with two
suppliers who've been good. But the following web page has a long
list of most of the US suppliers and would be a good start.
http://www.cdpr.ca.gov/docs/ipminov/bensuppl.htm
The two I have used are IPM Laboratories (315/497-2063, Locke NY) and
The Green Spot (603/942-8925, Nottingham, NH). Neither are near you
nor me in Wisconsin. Both owners are very active in promoting and
educating on the topic of biocontrol. They have excellent written
materials. And they are honest about what works.
I have been using biocontrol for several years. It works very well in
situations where plants & greenhouse are relatively stable. But in
more dynamic situation (ever changing plants or poor environmental
control) they are far less effective. You have to have the commitment
to see it through from the beginning. because initially you can
expect the pests to prevail. I can tell you as an old plant person it
was hard to watch the pests win. But now that things are stabilized
it I sold.
Good Luck,
John
---