As recently as 2004:

... facts suggest honeydew honey intensifies development of Nosema disease, especially during wintertime. Therefore, symptoms of dysentery (observed in such bee colonies), often accompanying consumption of honeydew honey are considered to be the acute form of Nosema disease.

In this study, however, no increase in mortality rate among bees related to the percentage of honeydew honey in winter stores was found. [We found] a beneficial effect that consists in the inhibition of N. apis development.

Pohorecka & Skubida, P. (2004). Healthfulness of honeybee colonies (Apis mellifera L.) wintering on the stores with addition of honeydew honey. Bull Vet Inst Pulawy, 48, 409-413.

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