The search behavior and parasitism of trichogrammatids can be affected by volatile compounds emitted by plants under herbivory and/or oviposition. Our aim was to evaluate the chemotactic behavior and parasitism rates of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) females against two varieties of corn and one of rice that underwent herbivory or oviposition by Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae). In a glass Y-tube olfactometer, the parasitoids were given the choice between plants damaged by either herbivory or oviposition, with and without sentinel eggs, against those without damage. We also evaluated the average of parasitized eggs and the parasitoid emergence in sentinel eggs, which were next to plants that underwent herbivory contrasted with eggs next to undamaged plants. Trichogramma pretiosum was more attracted to rice and corn plants evaluated 24 h after herbivory compared to undamaged plants. Parasitoids preferred oviposited rice plants over control plants. Oviposited corn plants after 48 h were more attractive than non-oviposited plants without sentinel eggs. In the presence of sentinel eggs on the olfactometer tests, there was no difference in oviposition preference in corn. Parasitism was higher in sentinel eggs located near plants damaged by herbivory. This suggested that the egg parasitoid T. pretiosum not only uses chemical clues from rice and corn plants, damaged by herbivory, but also uses them as a strategy to search and increase parasitism in S. frugiperda eggs. However, the results of oviposition tests showed that plants of different species and varieties might respond differently to this type of damage.

三线虫的搜索行为和寄生性会受到植物在食草和/或产卵下释放的挥发性化合物的影响。我们的目的是评估的趋化行为和寄生率赤眼蜂pretiosum莱利（膜翅目：赤眼蜂科）女性对两个品种的玉米和水稻，通过例行取食产卵或一个草地夜蛾（史密斯）（鳞翅目：夜蛾科）。在玻璃 Y 形管嗅觉计中，寄生物可以在被食草或产卵破坏的植物之间进行选择，有或没有哨兵卵，与没有受到伤害的植物。我们还评估了寄生卵的平均值和哨兵卵中的寄生蜂出现率，哨兵卵旁边的植物与未受损植物旁边的卵形成对比。红眼蜂与未受损的植物相比，在食草后 24 小时评估的水稻和玉米植物更吸引。与对照植物相比，寄生蜂更喜欢产卵的水稻植物。48 小时后产卵的玉米植物比没有前哨卵的非产卵植物更具吸引力。在嗅觉计测试中存在哨兵卵的情况下，玉米的产卵偏好没有差异。位于被食草动物破坏的植物附近的哨兵卵的寄生性更高。这表明卵寄生物T. pretiosum不仅利用受食草动物破坏的水稻和玉米植物的化学线索，而且还利用它们作为搜索和增加S. frugiperda寄生的策略蛋。然而，产卵试验的结果表明，不同物种和品种的植物对这种类型的损害可能会有不同的反应。