Summary
Labial gland disease causes swelling of the labial glands in the pupal stage inFormica species. The resulting adults have enlarged thoraces and are called secretergates (Wasmann's pseudogynes). They infect the younger larvae, probably during feeding. The agent of the disease is unknown. It soon becomes non-infectious outside the labial glands. Diseased females were not seen to feed larvae. Yet their offspring contained secretergates. The discrepancy remains unexplained.
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Elton, E.T.G. Labial gland disease in the genusFormica (Formicidae, Hymenoptera). Ins. Soc 38, 91–93 (1991). https://doi.org/10.1007/BF01242717
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DOI: https://doi.org/10.1007/BF01242717