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The role of semiochemicals in the avoidance of the seven-spot ladybird, Coccinella septempunctata, by the aphid

Yoshitaka Nakashima¹, Michael A Birkett, Barry J Pye

¹Laboratory of Entomology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan.

Journal of Chemical Ecology

|August 12, 2004

Summary

This summary is machine-generated.

Ladybird beetles (Coccinella septempunctata) release chemicals that deter beneficial aphid parasitoids (Aphidius ervi). These semiochemicals, including specific hydrocarbons, reduce parasitism rates, offering potential for biological control strategies.

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Area of Science:

Chemical Ecology
Entomology
Biological Control

Background:

Intraguild interactions are crucial in ecological communities.
Semiochemicals mediate complex behaviors between competing species.
Understanding these interactions is key for integrated pest management.

Purpose of the Study:

To investigate semiochemical-mediated interactions between Coccinella septempunctata and Aphidius ervi.
To identify specific chemicals responsible for avoidance behavior in Aphidius ervi.
To assess the potential application of these semiochemicals in biological control.

Main Methods:

Behavioral assays using leaf choice tests with parasitoids.
Chemical analysis of ladybird extracts and footprint deposits using GC-MS.
Bioassays testing individual hydrocarbon compounds (n-tricosane, n-pentacosane).
Field application of semiochemicals to plants and assessment of parasitism rates.

Main Results:

Aphidius ervi females avoided areas previously visited by Coccinella septempunctata.
Ethanol extracts and specific hydrocarbons (n-tricosane, n-pentacosane) from C. septempunctata induced avoidance.
Plant treatment with these semiochemicals significantly reduced pea aphid parasitism rates by A. ervi.

Conclusions:

Specific hydrocarbons act as semiochemical cues mediating intraguild avoidance between ladybirds and parasitoids.
These findings highlight the ecological role of chemical communication in predator-parasitoid interactions.
The identified semiochemicals show promise for developing novel biological control strategies against aphids.