Description Plagues of the Desert Locust (Schistocerca gregaria) have threatened agricultural production in Africa, the Middle East, and Asia for centuries. The livelihood of at least one-tenth of the worlds human population can be affected by this voracious insect. The Desert Locust is potentially the most dangerous of the locust pests because of the ability of swarms to fly rapidly across great distances. It has two to five generations per year. The northern highlands of Ethiopia (Tigray) and Eritrea slow the movements of desert locusts to the breeding areas of the Red Sea coast.