Spanish olive farmers find an amazingly low-tech alternative to poisonous insecticides

Next time you drizzle olive oil on your salad, give a thought to the larvae of the olive fly, which love olives as much as you do. Every year in Catalonia, Spain, farmers have to fight these pests so they don’t ruin the year’s crop. The customary method is to spray with insecticides, but in recent years a simpler weapon has gained favor: the olive fly trap.