Although much has been said of the
possibility of controlling some insect pests
with Microsporidia, no very satisfactory
ways have been found of preserving infective
spores for long.

Storing of viable spores is difficult. 
The best methods to date
are keeping viable spores in water at 0 C or
using hibernating host insects as spore reserves.

Microsporidia do not stay infective for more
than a few months when kept dry, or in
water, or in their dead host, even at about
0 C (Weiser, 1963). The same applies to
spores of Nosema apis

The Preservation of Infective Microsporidian Spores, BAILEY

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