The role of semiochemicals in the avoidance of the seven-spot ladybird, Coccinella septempunctata, by the aphid parasitoid, Aphidius ervi
| Autor: | Michael A. Birkett, John A. Pickett, Yoshitaka Nakashima, Wilf Powell, Barry J. Pye |
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| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Chromatography
Gas Time Factors Biological pest control Parasitism biological control n-tricosane Biology Biochemistry Gas Chromatography-Mass Spectrometry Pheromones Parasitoid n-pentacosane Alkanes Botany Animals trail Pest Control Biological Ecology Evolution Behavior and Systematics Larva Aphid oviposition decision fungi food and beverages General Medicine biology.organism_classification Coccinella septempunctata Acyrthosiphon pisum Coleoptera Horticulture Aphids Predatory Behavior predator avoidance Solvents Female Seasons Intraguild predation intraguild predation |
| Zdroj: | Journal of Chemical Ecology. 30(6):1103-1116 |
| ISSN: | 0098-0331 |
| Popis: | application/pdf 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 presence of the hydrocarbons. Parasitism rates of the pea aphid, Acyrthosiphon pisum, on broad bean plants, Vicia faba, which had been sprayed with a mixture of the chemicals, were lower than those on control plants. The effect, however, was no longer evident if parasitoid foraging was delayed by 24 hr after the plants were treated. The ecological significance of intraguild avoidance behavior and implications for possible use of the semiochemicals involved in future biological control programs are discussed. |
| Databáze: | OpenAIRE |
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