We investigated the emergence of third-stage larvae (L3) of Umingmakstrongylus pallikuukensis from the slugs Deroceras laeve, Deroceras reticulatum, and the snail Catinella sp. in the laboratory and from D. laeve on the tundra. Third-stage larvae emerged from 8 of 8 D. laeve and 8 of 8 D. reticulatum housed at 20 C in darkness and from 9 of 10 D. laeve and 5 of 5 Catinella sp. housed at 21 C with 10–12 hr of light/day. Larvae emerged from D. laeve and D. reticulatum over a wide range of infection intensities (2–179 and 20–65, respectively), and the patterns of emergence were independent of intensity. The majority of the L3 emerged from most of the Deroceras spp. by 58 or 60 days postinfection (PI). Lower rates of emergence were observed from Catinella sp. Larvae emerged from D. laeve on the tundra by 10 wk PI and were recovered from the vegetation in some experimental enclosures the following year. Third-stage larvae survived in tap and distilled water at 0–4 C for 13 mo. Emergence of L3 of U. pallikuukensis from the intermediate host may increase the temporal and spatial availability of L3 and enhance their survival and transmission.
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