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VOL. 11, ISSUE 4 (2026)
Floral trapping mechanisms in moth plant (Araujia sericifera) and the behavioural responses of flower-visiting insects in Southern France
Authors
Ram Singh
Abstract
The moth plant, Araujia sericifera Brot. (Apocynaceae), is an
invasive climbing vine known for a specialized floral mechanism that can trap
the mouthparts of visiting insects. This study investigated floral morphology
associated with proboscis entrapment and examined the diversity and behaviour
of flower-visiting insects in residential areas of Saint-Barnabé, Marseille,
southern France, during September–October 2026. Observations were conducted on
two flowering vine clusters occupying approximately 40 and 80 ft²,
respectively, from 7 September to 15 October 2026. Insect visitation, trapping
events, escape responses, and pollinarium removal were recorded during 15
morning observation sessions. Fourteen insect species belonging to Lepidoptera,
Hymenoptera, and Diptera were documented. The cabbage white butterfly, Pieris
rapae, was the most frequently recorded lepidopteran visitor and was
observed becoming trapped while attempting to obtain nectar. Floral dissection
revealed a specialized gynostegium, narrow anther guide rails, and a
corpusculum–pollinia complex associated with pollen attachment and transfer.
Butterfly entrapment was attributed to the engagement of their proboscises
within restricted floral guide channels, whereas stronger visitors,
particularly the buff-tailed bumblebee (Bombus terrestris), violet
carpenter bee (Xylocopa violacea), European honeybee (Apis mellifera)
and hummingbird-hawk moth (Macroglossum stellatarum) successfully removed
pollinaria during nectar feeding essential for pollination. The bumblebee
showed particularly effective pollinarium removal under the observed
conditions. The Asian hornet (Vespa velutina) frequently visited flowers
and chased other insect visitors, although no pollinarium removal was detected
following its visits. These observations illustrate contrasting outcomes of
floral visitation, including potential pollen transfer, mechanical entrapment,
and interference by predators. Further quantitative experiments are needed to
verify the proposed force thresholds and determine the contribution of
different visitors to successful pollination.
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Pages:129-137
How to cite this article:
Ram Singh "Floral trapping mechanisms in moth plant (<i>Araujia sericifera</i>) and the behavioural responses of flower-visiting insects in Southern France". International Journal of Entomology Research, Vol 11, Issue 4, 2026, Pages 129-137
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