caa a22 4500 397570422 CHVBK 20180308164839.0 cr unu---uuuuu 161202e19961201xx s 000 0 eng 10.1093/ee/25.6.1391 doi (NATIONALLICENCE)oxford-10.1093/ee/25.6.1391 Tritrophic Interactions Among Linear Furanocoumarins, the Herbivore Trichoplusia ni (Lepidoptera: Noctuidae), and the Polyembryonic Parasitoid Copidosoma floridanum (Hymenoptera: Encyrtidae) [Elektronische Daten] [Stuart R. Reitz, John T. Trumble] Secondary plant metabolites can affect parasitoids directly or indirectly through their action on the parasitoid host. We assessed if the linear furanocoumarins, psoralen, bergapten and xanthotoxin, secondary plant metabolites present in Apium spp. and other taxa, exerted direct or indirect effects on Copidosonma floridanum (Ashmead), a polyembryonic parasitoid of Trichoplusia ni (Hübner), through diet incorporation bioassays. Because linear furanocoumarins are photoactivated, we tested for these effects in the presence and absence of UV radiation. Increasing concentrations of linear furanocoumarins prolonged larval development of T. ni, but resulted in greater pupal mass. Furthermore, increasing concentrations of linear furanocoumarins increased T. ni mortality, but only marginally. However, increasing concentrations of linear furanocoumarins in the host diet significantly increased mortality of the parasitoid. There were no significant differences in the number of reproductive parasitoid larvae among treatments, indicating that linear furanocoumarins did not interfere with polyembryonic development of C. floridanum, but exerted toxicity after the parasitoid larvae began feeding on host tissue. Supplemental UV radiation slowed development, but it did not affect survival of either T. ni or C. floridanum. Because of the differential effects on the host and parasitoid, linear furanocoumarins, at naturally occurring concentrations, can mediate this host-parasitoid relationship through direct effects on the parasitoid, and not merely as a consequence of their effect on the host. © 1996 Entomological Society of America Physiological and Chemical Ecology nationallicence tritrophic interactions nationallicence Apium nationallicence linear furanocoumarins nationallicence UV radiation nationallicence Reitz Stuart R. Department of Entomology, University of California, Riverside, CA 92521 aut Trumble John T. Department of Entomology, University of California, Riverside, CA 92521 aut Environmental Entomology Oxford University Press 25/6(1996-12-01), 1391-1397 0046-225X 25:6<1391 1996 25 ee https://doi.org/10.1093/ee/25.6.1391 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.6.1391 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Reitz Stuart R. Department of Entomology, University of California, Riverside, CA 92521 aut NATIONALLICENCE 700 1- Trumble John T. Department of Entomology, University of California, Riverside, CA 92521 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/6(1996-12-01), 1391-1397 0046-225X 25:6<1391 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford