Host exploitation by Dinocampus Coccinellae (Schrank) [Hymenoptera: Braconidae] Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cz30px17t

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  • Ecological relationships between D. coccinellae and its coccinellid hosts were examined in the Willamette Valley, Oregon, in 1982. The distribution and relative abundance of seven species of coccinellids from eight collecting sites were monitored to determine percent parasitism by D. coccinellae on a spatial and temporal basis. Host size and host suitability were addressed in the laboratory. Overall, D. coccinellae parasitized approximately 27% of the 2272 beetles collected from April through August. The number of beetles collected and the number parasitized were highest in July and August. Levels of parasitism significantly differed according to host species, host habitats and month collected. Coccinellids collected on peppermint and clover showed significantly higher levels of parasitism than the other six sites. A significantly higher degree of parasitism was seen in the coccinellids Hippodamia converqens Guerin-Meneville and Hippodamia sinuata Mulsant. Coccinella californica Mann was parasitized significantly less than the other coccinellid species in this study. One common species of predaceous coccinellid, Adalia bipunctata (L.) was never found parasitized. Host density did not affect parasitism. Size did not appear to be a factor in the selection of hosts at the species level of selection. Two of the three most heavily parasitized coccinellid species were the smallest species in this study, the other was the second largest species. The largest species, C. californica, showed a low level of parasitism (4%). Within species, there appeared to be a size effect in the smaller hosts. Individuals of suitable host species below a volume of 10mm³ were never found parasitized by D. coccinellae. The non-suitability of Adalia bipunctata as a host for D. coccinellae was examined in the laboratory. Parasitoids always selected other hosts if given a choice in laboratory experiments. Ovipositor probing by D. coccinellae into A. bipunctata could be provoked by isolating female parasitoids without hosts for three days and then exposing them to A. bipunctata with no other host species present. Females appeared to oviposit but no evidence of parasitism was detected in dissections of the hosts.
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