Margosan-O is a product of the Neem tree.
 
It is a pesticide and should be used as instructed on the label.  It is
still being tested here for outdoor pests.  I don't know if it is labeled
for use in bee colonies.  I will try to get better info, unless someone
answers before I find out.
 
SHARON J. COLLMAN
W.S.U. COOPERATIVE EXTENSION
URBAN IPM RESOURCE CENTER
@ CENTER FOR URBAN HORTICULTURE
UNIVERSITY OF WASHINGTON   GF-15
SEATTLE, WA  98195
 
PHONE: 206-543-8616
E-MAIL [log in to unmask]