A pheromone released by migratory locusts seems to encourage them to swarm, so placing it on sticky traps that attract the insects could stop them from devastating crops
Source:
https://www.newscientist.com/article/2251660-a-chemical-that-encourages-locusts-to-swarm-could-also-help-stop-them/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home