Antestia bug, Antestiopsis thunbergii Gmelin (Heteroptera: Pentatomidae) is a major pest of Coffea arabica in eastern Africa. The pest damages both the vegetative and reproductive parts of the coffee plant but requires green (unripe) berries for nymphal development and adult reproduction. Consequently, the pest strongly prefers to feed on green berries in the field than any other coffee parts. In nature, insects often use their olfactory system to recognize and locate suitable hosts and avoid non suitable hosts. The identification of plant volatiles that act as pest kairomones (attractants) or allomones (defence/ repellent) can potentially lead to development of environmentally friendly pest management options. Our study compared the chemical profiles of unripe and ripe coffee berries. In addition, electrophysiological and behavioural responses of the pest to compounds unique to ripe berries were studied. Our findings on the olfactory cues used by the pest to avoid ripe berries (a non preferred host) and the implication in Antestia bug management in a “push- pull” system will be discussed.