H. B. I've been keeping Bz for 18 years now, and to answer your question, Honest to God, I don't know ! ! But I'd package some of it up in a small stout cardboard / tin box [like coff drops come in] and sent it to the Entomology Departmnt, Univ of Florida, in Gainesville, FL. Don't forget to write a short note inside the package WITH your return address. Oh, send a 1$ along to show your sincere and to hasten return information. Jon Peacock, Secretary Georgia Beekeepers Association.