Abstract
The role of host-plant factors in the oviposition behaviour of Etiella zinckenella was studied. The oviposition behavioural sequence is triggered by plant odour, water vapour, and mechanical stimuli. The water vapour causes an alighting response by females in the vicinity of the plant. Plant odour and water vapour act together to induce the abdomen-bending walk (scanning with ovipositor) on the plant. Mechanical stimuli are perceived through the ovipositor tip and induce egg deposition. There is no evidence for attraction by host odour from a distance nor for oviposition stimulation by contact chemicals.
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