Answering the love bug
question: Probably not. Love bugs don't have a known
aggregation pheromone, but are attracted to certain colors, surface temperatures, and to hydrocarbons.
I worked with stink bug alarm pheromones - the stink in the stink bug - looking for the gene that produces the diesel-fuel-like oil the alarm pheromone is suspended in while working on my biology/chemistry degree. Alder bugs are a close relative of the stink bug . . . and it was actually a discovery by another student, who found alder-bugs made very small quantities of diesel, that got me going on them.