The colonies in group 1 T produced less honey (14.5 ± 12.1 kg h/c) than the colonies in the other treated groups but more than the control ones, although these effects failed to reach statistical significance ( P > 0.05).
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Nosema spp. infection and its negative effects on honey bees (Apis mellifera iberiensis) at the colony level.
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An intra-group evaluation of the percentage of bees infected in spring 2008 revealed a decreasing trend in the 2 T and 4 T groups and an increasing trend in the 1 T, CS and C groups between May and July (Figure 3 , see Additional files 3 and 5 ).