[ramblingrain]

I replied a few levels up mentioning kaolin spray (http://en.wikipedia.org/wiki/Kaolin_spray).

For more information about 'particle films' (like kaolin spray) see this document. There are numerous compounds mentioned and very interesting references too. These techniques also can be mixed with conventional pesticides and achieve the same efficacy as pure pesticide.

Particle Films: A New Technology for Agriculture - http://blog.meyvelitepe.org/images/Book_Chapter_Particle_Fil...

"At the present time, a commercial particle film material, Surround crop protectant, is being used in about 90% of the Pacific Northwest pear market for the early season control of pear psylla and approximately 20% of the Washington State apple market to reduce sunburn damage."