Pheromone refers to a type of secretion that triggers reactions to members of the same species. They normally impact the behavior of another individual. There are different types of pheromones. Some of these are alarm, food trail and sex pheromones.
Alarm pheromones are produced by certain insect that will act when attacked. Insects such as ants, termites and bees will produce a certain smell when they are attacked by a predator. Some plants also produce them. This will cause other plants inedible to herbivorous.
There are also aggregation pheromones. These act by overcoming host by mass attack, predators and mate selection. The word aggregation here will mean in large numbers. Most sex pheromones will be produced by females. The males too can produce them, as they are sex attractant. The pea and bean evil are the most common.
In insects, there are epideictic pheromones that are used to mark territories. Insects will lay their eggs on certain fruits to signal to other insects that they should find other places to clutch.
Territorial pheromones are quite similar to the epideictic ones. It is a term that is used to refer to pheromones produced to mark boundaries by animals like dogs and cats. These animals may use urine as a pheromone sign.
Another type of pheromones is the releaser pheromones. These are the most commonly produced. They are secreted in order to influence the behavior of the same species. Some insects will produce molecules in order to attract males that may be at a distance. This distance may vary from one to two miles, and the smell does not usually last for long.
Primer pheromones are quite different from other pheromones that trigger the behavior of a species. They trigger change in developmental undertakings.
Other common pheromones are sex pheromones that are used to indicate the readiness for mating. They are produced in order to attract the opposite sex.