Females use the serrated edge of the ovipositor to cut small holes in plants and deposit eggs. Females are capable of producing eggs asexually if they lack a mate. They feed for 7–14 days. Advantages. Female thrips lay their eggs in tiny slits cut into the surface of leaves, flowers, and stems. This pest feeds on the tender, pale green leaves causing sunken, reddish to purplish spots along the midrib. Heavily infested leaves eventually become tough and brown or yellow. Unlike most caterpillar species, they eat or rasp out a hollow in plant matter in which to lay their eggs, providing them shelter from potential predators. Leaf-feeding and flower thrips deposit eggs into plants through an egg-laying apparatus called an ovipositor. Thrips feed mainly on the upper surfaces of the leaves along with flowers, buds, fruits and vegetables. Most thrips are brown and some have wings and some don’t. The eggs hatch into hungry larvae that can mature in as little as two weeks. In fact, thrips can come in many forms, from wormy nymphs to dark or golden winged insects, depending on the stage of life and where you live. As the infestation progresses, the leaves will mottle, turn yellowish or silverish. Thrips are tiny insects with piercing and sucking mouth parts. There may be tiny black spots on leaves due to the insect’s excrement. Reproduction & Life Cycle. Will reduce the spread of Thrips by capturing the adult. Adults can live up to thirty days, and the females lay 2- 10 eggs per day. Plants that have been damaged by thrips become dull green and develop a silvery-white discoloration of the upper surface (A metallic sheen on leaves is one sure indicator of Thrips). Adult saw-tailed thrips are primarily female, because female thrips develop from unfertilized eggs, while male thrips develop from fertilized eggs. The young, called nymphs, are cream to pale green and only visible with magnification. They’ll attract the adult Thrips and capture them which means that they won’t be able to lay eggs in the other plants. If you increase temperature by five more degrees they become adults in just thirteen days!. Thrips have two pairs of wings and are normally whitish/yellowish (adults are a little darker). Source: Scot Nelson. Thrips also can transmit serious plant diseases. The larvae, or the teenagers, are wingless. They are found on the underside of the leaves, where they pierce the plant tissues to suck sap and lay their eggs. Immature thrips cause the leaves to curl inward or fold into a pocket in which the thrips continue to develop and in which they lay eggs. Adult thrips are small, fast-moving insects, while young thrips look like tiny unmoving pale worms on the leaves. The eggs can be laid any time of year and hatch within a few days in warm, indoor conditions. Eggs are deposited on young leaves and in buds. 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