(Z)-9-Tricosene, known as muscalure, is an insect pheromone found in dipteran flies such as the housefly.

It is used as a pesticide, as in Maxforce Quickbayt by Bayer, luring males to traps to prevent them from reproducing.

(Z)-9-Tricosene is a sex pheromone produced by female house flies (Musca domestica) to attract males.

In bees, it is one of the communication pheromones released during the waggle dance.

The process is mediated by a cytochrome P450 enzyme and requires oxygen (O2) and nicotinamide adenine dinucleotide phosphate (NADPH).