pheromones

Interesting information. The odour sense is very important for insects. It is used for finding food, escaping enemies and finding a mate. Odours used to send messages between individuals of the same species are called pheromones.
The class of pheromones most widely explored are the sex pheromones in insects. In most cases it is produced by a female to attract a male of the same species
When used in combination with traps
can be used to determine what insect pests are present in a crop and what plant protection measures or further investigations might be in order to assure that there is no really bad damage to the crop