Thrips: Tiny Insects with Major Damage Thrips are among the most destructive pests affecting onions and leeks, particularly during warm, dry conditions. These tiny, slender insects feed by piercing plant cells and sucking out sap, leaving characteristic silvery streaks and stippling on leaves. Severe infestations stunt growth, reduce bulb size, and can predispose plants to … Continue reading Onion and Leek Pests: Thrips, Maggots, and Rot