Well, I had better pass along a correction to my post. I emphasized the rhizosphere and the phyllosphere as places to focus organic agricultural practices like compost teas and IMO's.
So when I came across the following article, "Endophytic Microorganisms: A Review on Insect Control and Recent Advances on Tropical Plants" I just added it to my phyllosphere resources. Yet, endophytic vs epiphytic didn't sound right so I went back and actually read part of this 32-page article. Indeed, these are endophytes, they live inside the plant and colonize internal host tissues, etc. So, it's not as directly relevant, but still an interesting article about another group of plant-microbes. Steve Diver > Yet, here is a paper on phyllospheric organisms, and > how these endophytic organisms can help promote plant > growth and achieve biological control of diseases > AND insects on the leaf surface. > > Endophytic Microorganisms: A Review on Insect Control > and Recent Advances on Tropical Plants > Electronic Journal of Biotechnology > Vol.3 No.1, Issue of April 15, 2000 > http://www.ejb.org/content/vol3/issue1/full/4/index.html