Abstract Insect herbivores are more likely to successfully use a novel host if the plant is closely related to the ancestral host and the insect is polyphagous. Emerald ash borer (EAB), Agrilus planipennis (Fairmaire) (Coleoptera: Buprestidae), is a specialist wood borer of ash (Fraxinus spp., Lamiales: Oleaceae) trees and one of the most destructive forest pests in North American forests. Recent studies have found that larvae can develop in stems of two ash relatives; white fringetree (Chionanthus virginicus (L.) [Laminales: Oleaceae]) and cultivated olive (Olea europaea (L.) [Laminales: Oleaceae]). For EAB adults, the ability to consume, successfully mate, and lay viable eggs on foliage of these hosts is unknown.Thus, we conducted two no-choice assays with adult EAB on foliage of white fringetree and olive paired with positive controls of susceptible ash. Larval performance was also examined in a reciprocal study with cut stems of white fringetree and green ash (Fraxinus pennsylvanica Marshall) to determine whether adult diet impacted the success of progeny. Longevity, consumption rates, and fecundity of adults were similar on white fringetree and ash foliage. In contrast, adults consuming olive died quickly, consumed more over time, and females laid far fewer eggs compared to those on ash. Adult diet did not impact larval success, but larvae in white fringetree stems grew slower. These results indicate that white fringetree is a suitable host for EAB to complete its lifecycle, although larvae perform more poorly on this host than in susceptible ash species. In contrast, the more distantly related olive appears to be a poor host for adult EAB, although some viable eggs were produced by females.

中文翻译：

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成年翡翠螟（鞘翅目：Buprestidae）在两个新寄主的叶子上的摄食、存活和繁殖力以及对寄主范围扩展的影响

摘要 如果植物与祖先寄主关系密切且昆虫是多食性的，则昆虫食草动物更有可能成功利用新寄主。翡翠灰螟 (EAB)，Agrilus planipennis (Fairmaire)（鞘翅目：Buprestidae），是一种专业的灰螟（水曲柳属，唇形目：木犀科）树木，也是北美森林中最具破坏性的森林害虫之一。最近的研究发现，幼虫可以在两个灰烬亲戚的茎中发育；白色条纹树（Chionanthus virginicus (L.) [Laminales: Oleaceae]）和栽培橄榄（Olea europaea (L.) [Laminales: Oleaceae]）。对于 EAB 成虫，它们是否有能力在这些宿主的叶子上进食、成功交配和产卵是未知的。因此，我们用成年 EAB 对白穗树和橄榄的叶子进行了两次无选择试验，并与易感灰烬的阳性对照配对。在一项对白穗树和绿灰 (Fraxinus pennsylvanica Marshall) 切茎的相互研究中，还检查了幼虫的表现，以确定成虫饮食是否影响后代的成功。白穗树和白蜡叶上的成虫寿命、消耗率和繁殖力相似。相比之下，食用橄榄的成年人死亡很快，随着时间的推移消耗更多，与食用灰烬的雌性相比，雌性产下的卵要少得多。成虫饮食不会影响幼虫的成功，但白色流苏茎中的幼虫生长较慢。这些结果表明，白边树是 EAB 完成其生命周期的合适宿主，尽管幼虫在该宿主上的表现比在易感灰树种中表现更差。