Abstract
The morphology and secretory cycle of the hypopharyngeal glands of diseased (nosemosis) and healthy worker honey bees ( Apis mellifera) were dissimilar. Those of diseased bees suffered from regressive changes; the volume of the lobules of the glands decreased progressively; the nuclei disintegrated; the chromatin coalesced; and the cytoplasm and the size of the secretory globules were extremely reduced, leading to malformation of the hypopharyngeal gland. The number of spores of Nosema apis counted in the midgut of diseased worker bees correlated with the appearance of the hypopharyngeal glands. The inactivity of these brood-food glands in infected bees helps to explain why such bees do not usually attend the queen and thus afford her a measure of escape from infection.
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