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Biological control agents: U
Ucona acaenae (Hymenoptera: Tenthredinidae), sawfly
Unidentified (Coleoptera)
Unidentified (Neuroptera: Chrysopidae)
Unidentified (Hymenoptera: Dryinidae)
Unidentified (Hymenoptera: Scelionidae)
Unidentified (Hymenoptera?)
Unidentified chalcid (Hymenoptera: Chalcidoidae)
Unidentified sp. (Hymenoptera: Ichneumonidae)
Unidentified sp. (spp.?) (Diptera: Tachinidae)
Unidentified sp. A (Diptera: Tachinidae)
Unidentified sp. B (Diptera: Tachinidae)
Unidentified sp. C (Diptera: Tachinidae)
Uromyces pencanus (Pucciniales: Pucciniaceae)
Urophora cardui (Diptera: Tephritidae), Californian thistle gall fly
Urophora solstitialis (Diptera: Tephritidae), nodding thistle gall fly
Urophora stylata (Diptera: Tephritidae), Scotch thistle gall fly