The parasitoid wasp Diadegma semiclausum Hellen (Hymenoptera: Ichneumonidae) is an effective endoparasitoid for controlling the larvae of Plutella xylostella (L.) (Lepidoptera: Plutellidae). Fertilizer application can induce resistance mechanisms in plants against herbivores. In bottom-up effects, resistance-related signaling pathways triggered by fertilizers in plants may affect the fitness of natural enemies. This study aimed to investigate the effect of induced resistance by vermiwash on some fitness-related parameters of D. semiclausum, including immature survival, development time, reproduction, and life table parameters. The experiment was conducted in a standard climate chamber set at 25 ± 1 °C, a photoperiod of 16 h light: 8 h dark, and 65 ± 5% RH. The results showed that D. semiclausum developing within P. xylostella larvae reared on vermiwash-treated canola plants had a longer duration and lower survivorship of immature stages than those developing within P. xylostella larvae reared on untreated canola plants (control). Furthermore, the parasitoid females that emerged from the vermiwash treatment deposited fewer eggs compared to those emerging from the control treatment. The R₀ and r values of D. semiclausum were lower on the vermiwash treatment (9.96 offspring/female and 0.150 day⁻¹, respectively) compared to the control population (15.94 offspring/female and 0.198 day⁻¹, respectively). These results suggest that if vermiwash is sprayed on canola and P. xylostella larvae feed on the plant, it has the potential to adversely affect the population growth of D. semiclausum. Therefore, more care should be taken regarding the application of this fertilizer in D. semiclausum-based integrated pest management (IPM) programs.

寄生蜂Diadegma semiclausum Hellen（膜翅目：姬蜂科）是一种有效控制小菜蛾（ L.）（鳞翅目：小菜蛾科）幼虫的内寄生蜂。施肥可以诱导植物对食草动物的抵抗机制。在自下而上的效应中，植物中肥料触发的抗性相关信号通路可能会影响天敌的适应性。本研究旨在探讨蠕虫水诱导抗性对半钩蝽一些健康相关参数的影响，包括未成熟存活、发育时间、繁殖和生命表参数。实验在标准气候室中进行，温度设置为 25 ± 1 °C，光周期为 16 小时光照：8 小时黑暗，相对湿度 65 ± 5%。结果表明，与未经处理的双低油菜植物（对照）上饲养的小菜蛾幼虫相比，在经蚯蚓洗处理的双低油菜植物上饲养的小菜蛾幼虫中发育的小菜蛾幼虫具有更长的持续时间和更低的未成熟阶段存活率。此外，与对照处理中出现的雌性相比，从蠕虫清洗处理中出现的寄生雌性产下的卵较少。与对照群体（分别为15.94子代/雌性和0.198天-1 ）相比，蠕虫清洗处理中的R ⁰和r_值较低（分别为9.96子代/雌性和0.150天^-1）。这些结果表明，如果在双低油菜籽上喷洒蠕虫水，并且小菜蛾幼虫以该植物为食，则有可能对小菜蛾的种群生长产生不利影响。因此，在以小蠹虫为基础的害虫综合防治（IPM）计划中使用这种肥料时应更加小心。