caa a22 4500 397571739 CHVBK 20180308164843.0 cr unu---uuuuu 161202e19960201xx s 000 0 eng 10.1093/ee/25.1.207 doi (NATIONALLICENCE)oxford-10.1093/ee/25.1.207 Chang Gary C. Department of Zoology, Duke University, Durham, NC 27706 Comparison of Single Versus Multiple Species of Generalist Predators for Biological Control [Elektronische Daten] [Gary C. Chang] An open question in biological control concerns the value of using multiple as opposed to a single species of natural enemies. To find out how the mechanisms by which multiple biocontrol agents might interact, I conducted laboratory experiments quantifying the behavior and effectiveness of predator species used either singly or in combination to control bean aphids, Aphis fabae Scopoli. The predators were larvae of a lacewing, Chrysoperla plorabunda (Fitch), and the sevenspotted lady beetle, Coccinella septempunctata L. The experiments consisted of 4 treatments tested in a 2 × 2 factorial design crossing 0 or 1 first-instar C. plorabunda with 0 or 1 first-instar C. septempunctata per fava bean plant, Vicia faba L. I also tested 2 additional treatments of 2 larvae of a single species, for a total of 6 treatments. The predators slowed the growth of aphid populations; no evidence of interaction between the predator species could be seen in terms of their effects on the sizes of the final aphid populations. This result may be explained by the finding that larvae of C. plorabunda and C. septempunctata differed significantly in where they were most frequently found on the plant. No clear evidence for intraguild predation was found. Thus, the majority of the data indicated that C. plorabunda and C. septempunctata did not have significant interactions. © 1996 Entomological Society of America Biological control nationallicence Aphis fabae nationallicence Chrysoperla plorabunda nationallicence Coccinella septempunctata nationallicence generalist predators nationallicence multispecies interactions nationallicence biological control nationallicence Environmental Entomology Oxford University Press 25/1(1996-02-01), 207-212 0046-225X 25:1<207 1996 25 ee https://doi.org/10.1093/ee/25.1.207 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.1.207 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Chang Gary C. Department of Zoology, Duke University, Durham, NC 27706 NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/1(1996-02-01), 207-212 0046-225X 25:1<207 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