Scott Moser wrote:     Second question is, has anyone else ever noticed that
dusting the bees with TM-25 and powdered sugar causes dysentery in the bees?

Scott:

Does the powdered sugar contain cornstarch?  Some beekeepers find that the
cornstarch will contribute to dysentery.  Powdered sugar without cornstarch is
a bit hard to find, you have to shop around.

Judy in Kentucky, USA