1) Pheromone, notably 
Substance which attracts animals. Some attractants fulfill natural biological functions such as mating or predation: others may be used to attract animals for monitoring or for control. See also pheromone
Liquid, solid or power form of scent applied to fishing lures for increased productivity.
(from the article `chemoreception`) At least four classes of chemicals are recognized that affect feeding behaviour: (1) attractants: odours eliciting movement toward the source; (2) ...
A chemical or agent that lures insects or other pests by stimulating their sense of smell. Attractan
Material with odour that attracts insects (lure and kill) used to lure insects to traps, or poison-bait stations. Usually classed as food, oviposition and sex attractants.
A chemical or agent that lures insects or other pests by stimulating their sense of smell. 
a substance that attracts insects; pheromones are chemical attractants
an attracting agent or substance; lure: the sex attractant of the cockroach; a synthetic attractant used to bait insect traps.