Abstract: The behavioural response of individual male Ancylis sativa Liu to synthetic sex pheromone components, E9-12∶Ac and Z9-12∶Ac was observed in a wind tunnel. The lures containing only E9-12∶Ac could stimulate some males (8.3%) to perform all the typical behaviours including exiciting, taking off, flying upwind,landing on the lure and exhibiting their hairpencils,while none of them showed any response to another component, Z9-12∶Ac.71.7%～76.7% of the males displayed their hairpencils in response to the mixture of these two components(E accounting for 60%～65%).The pheromone (E∶Z=6.5∶3.5) from 200 ng to 2 000 ng per lure caused more male response than that of 20 ng or 20 000 ng.

Key words: Ancylis sativa, sex pheromone, wind tunnel, behavioural response