Factors affecting the response of Ceutorhynchus assimilis Payk. (Col., Curculionidae) males to conspecific odour

The effect of post‐emergence feeding on the response of Ceutorhynchus assimilis males to conspecific odour was studied using both laboratory‐overwintered and field‐collected weevils. The response of males to females at different times in the season was also investigated using field‐collected weevils. Males did not respond to the odour of virgin females that were newly emerged from diapause. However, they showed a significant response to the odour of overwintered virgin females that had spent some days on flowering rape. The response of males to females appeared to decline as the season progressed.