A whitewash made from clay (yup, clay!) may improve the possibilities of
organic fruit production. At least is has the potential to greatly reduce
pesticide use, because it makes a physical barrier for insects.  It also
protects fruit from damaging spectra of light, can serve as a frost barrier
and has many other advantages that are yet unexplored. Best of all, it's
nontoxic (some of the pills you take have kaolin clay as a base).  I expect
it should be nontoxic to bees.

The full story:
http://www.ars.usda.gov/is/AR/archive/nov00/white1100.htm


Dave Green
The Pollination Home Page:  http://pollinator.com