Effect of physiological status on olfactory and visual responses of femaleHypothenemus hampei during host plant colonization

The response of Hypothenemus hampei (Ferr.) (Coleoptera, Scolytidae) (coffe e berry borer, CBB) females to olfactory stimuli was demonstrated to be rel ated with the physiological status; especially with age, whether they were mated or not, and whether they have already oviposited. A special behaviour , the abandonment of the native berry, was also found to play a major role. In contrast, response to visual stimuli (false coffee berries) was found t o be independent of the physiological status of CBB females. Variations in behavioural. responses to visual and olfactory stimuli are discussed in rel ation to colonization strategy.