美洲斑潜蝇和南美斑潜蝇的卵和幼虫都隐藏在叶片表皮内，南美斑潜蝇幼虫常潜入叶片下表层叶脉、叶柄和嫩茎中，因此药剂防治幼虫比较困难，但其成虫则常在叶丛上层活动，雌成虫也刺孔为害叶片，它们大量为害时常造成叶片枯死，甚至幼苗全株枯死。成虫又是此虫迁移扩散的唯一虫 The eggs and larvae of L. occidentalis and L. chevrieri are hidden in the epidermis of leaves. Larval L. sativa often larvae into the veins, petioles and tender stems of the lower leaves of the leaves, making it more difficult to control larvae, but their adults usually Activities in the upper leaves, female adults also puncture damage leaves, they often cause damage to leaves a large number of dead, even the whole plant died of seedlings. Adult worm is the only migratory insect proliferation