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SUMMARY

  • 1
    Species of Passaloecus seal their nests with a sticky material. Mass spectrometric comparisons showed this to resemble a pine resin.
  • 2
    Thin layer chromatography confirmed that the wasp door material was chemically similar to resin found in some conifer species near the nest.
  • 3
    Pine resin is an ideal ‘door material’, and its repellent properties may deter predators.