Discusses the development of a trap for Mexican fruit fly (mexfly). Availability of ineffective traps in the market; David C. Robacker's approach in exploiting the fruit fly's attraction to various bacteria; Synthesization of a bacterial perfume to attract mexflies; Cheaper cost of the Robacker's mexfly trap; Utilization of a strain of `Staphylococcus aureus' bacterium by Robacker; Other procedures employed.