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| Nakashima, Yoshitaka; Birkett, Michael A.; Pye, Barry J.; Powell, Wilf; 仲島, 義貴. |
| The avoidance responses of aphid parasitoids with varying host ranges (Aphidius eadyi, Aphidius ervi, and Praon volucre) to chemical trails deposited by intraguild predatory ladybirds, Coccinella septempunctata and Adalia bipunctata, were investigated. Females of all three parasitoid species avoided leaves previously visited by C. septempunctata or A. bipunctata adults. The avoidance responses shown by the two Aphidius species were stronger to trails of C. septempunctata than to those of A. bipunctata. However, P. volucre avoided trails of both ladybird species to a similar degree. Dose responses of these three parasitoid species to the hydrocarbons n-tricosane (C23H48), n-pentacosane (C25H52), and n-heptacosane (C27H56), which are components of the trails... |
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Palavras-chave: Intraguild predation; Predator avoidance; Trail; Oviposition decision; Host range; Habitat similarity; Dose response. |
| Ano: 2006 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/810 |
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| Nakashima, Yoshitaka; Birkett, Michael A.; Pye, Barry J.; Pickett, John A.; Powell, Wilf; 仲島, 義貴. |
| The role of semiochemicals in mediating intraguild interactions between the seven-spot ladybird, Coccinella septempunctata, and the aphid parasitoid, Aphidius ervi, was investigated. Female parasitoids avoided leaves visited by C. septempunctata adults and larvae during the previous 24 hr. Ethanol extracts of C. septempunctata adults and larvae also induced avoidance responses by A. ervi. Two of the hydrocarbons identified by gas chromatography ( GC) and coupled GC-mass spectrometry (GC-MS), n-tricosane (C23H48), and n-pentacosane (C25H52), when tested individually at levels found in the adult extract, induced avoidance by A. ervi. Further investigation of the larvae extract, and footprint chemicals deposited by adults in glass Petri dishes, confirmed the... |
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Palavras-chave: Intraguild predation; Predator avoidance; Trail; Oviposition decision; Biological control; N-tricosane; N-pentacosane. |
| Ano: 2004 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/809 |
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