Gall wasps in the cynipid genus Diplolepis Geoffroy (Hymenoptera: Cynipidae) attack various species of native and introduced roses in Canada. Although gall forms are diverse, gall wasps are parasitised by highly concordant complexes of parasitoids and inquilines. Many species of gall wasps attack the same host plants and develop over the same periods in the season, suggesting that opportunistic parasitoids may be exploiting a range of hosts rather than specialising. We sampled larvae of Eurytoma Illiger (Hymenoptera: Cynipidae) from galls of D. variabilis (Bassett) and D. rosaefolii (Cockerell), gall inducers that develop fairly synchronously late in the growing season on leaves of Rosa woodsii Lindl. (Rosaceae) in the Okanagan Valley of central British Columbia, Canada. Galls were sampled at five different sites along a gradient from the north end of the valley to the Canada–United States border, a distance of 100 km. We extracted DNA, then amplified and sequenced the cytochrome b segment for each Eurytoma larva. We identified two well-supported clades that were differentiated by neither sampling location nor host. Instead, at least two species of Eurytoma, E. imminuta Bugbee and E. longavena Bugbee, exist at these localities, and both exploit at least two of the Diplolepis hosts found at these sites.

cynipid属Diplolepis Geoffroy（膜翅目：Cynipidae）的蜂攻击加拿大的各种本地玫瑰和引进玫瑰。尽管胆汁形式多样，但胆汁黄蜂因寄生虫和喹啉类的高度一致的复合体而寄生。许多种类的of蜂攻击同一寄主植物并在同一时期发育，这表明机会性寄生虫可能正在利用一系列寄主，而不是专门化。我们从D. variabilis（Bassett）和D. rosaefolii（Cockerell）的胆汁中取样了Eurytoma Illiger（膜翅目：Cynipidae）的幼虫，这是在生长季节后期在Rosa woodsii的叶子上同步发育的胆汁诱导物林德 （蔷薇科）在加拿大不列颠哥伦比亚省中部的欧肯娜根谷。从山谷的北端到加拿大与美国的边界（距离为100公里），在五个不同的地点对胆进行了采样。我们提取了DNA，然后对每个Eurytoma幼虫进行了细胞色素b片段的扩增和测序。我们确定了两个支撑良好的进化枝，它们既没有采样位置也没有宿主。取而代之的是，在这些地方至少存在两种Eurytoma物种：E。imminuta Bugbee和E. longavena Bugbee，它们都利用了在这些地点发现的至少两个Diplolepis宿主。