• Terminal velocity of the first instarEctropis excursaria (Guenee) (Lepidoptera: Geometridae)

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    • Keywords


      Terminal velocity; Ectropis excursaria ; first instars; wind dispersal; silk length; anaesthetisation

    • Abstract


      The terminal velocity of first instarEctropis excursaria, determined in a part mechanical part electrical apparatus, were 114±12 cm/s and 118±12·5 cm/s for two different heights. Terminal velocity decreased exponentially with increased silk lengths. For a given length of silk there wsa a significant difference in the terminal velocity of live and anaesthetised insects. The significance of these results to the understanding of the wind dispersal of first instar caterpillars is discussed.

    • Author Affiliations


      R Ramachandran1 2

      1. Waite Agricultural Research Institute, Glen Osmond, South Australia - 5064
      2. Entomology Section, National Chemical Laboratory, Pune - 411 008, India
    • Dates


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