Held to leaves, branches, and trunks by means of gluelike sticker, the dispensers' job would be to saturate the air with Disparlure
, a commercially produced pheromone that mimics the natural chemical sex attractant of female moths.
Disparlure baits about 300,000 traps used in federal and state programs.
Still in an experimental stage, this kind of disparlure is used by FS and APHIS to permeate an entire forest.
The alternative disparlure is dispensed from airplanes by special hoppers that broadcast small chips of pheromone-impregnated plastic laminate.
A company called AgriSense in Fresno, California, sent Leonhardt several new types of polymeric microbeads containing this formulation, called racemic disparlure. These tiny impregnated microbeads can be distributed with normal aerial spraying techniques.
If the local males are too confused by disparlure to find these females and mate with them, it is assumed that indigenous females are also untouched.