Understanding competition between scelionid parasitoids that exploit the same host may provide insight into strategies that allow co-existence on a shared resource. Competition studies typically focus on interactions between native and exotic parasitoids that do not share an evolutionary history; however, co-evolved parasitoids may be more likely to demonstrate strategies to avoid or exploit a shared resource. We examined intrinsic and extrinsic competition between Asian Trissolcus japonicus Ashmead and T. cultratus Mayr (Hymenoptera: Scelionidae) associated...