Aggregation pheromone in Sternechus subsignatus (Coleoptera: Curculionidae): olfactory behaviour and temporal pattern of emission

Aggregation pheromone in Sternechus subsignatus (Coleoptera: Curculionidae): olfactory behaviour and temporal pattern of emission

The Brazilian soybean stalk weevil, Sternechus subsignatus Boehman (Coleoptera: Curculionidae), is a pest of economic importance in many regions of Brazil. Volatiles from both sexes of S. subsignatus were collected by aeration and the behavioural response of males and females was evaluated using a Y...

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Bibliographic Details
Published in:Journal of applied entomology (1986) Vol. 132; no. 1; pp. 54 - 58
Main Authors: Ambrogi, B.G, Zarbin, P.H.G
Format: Journal Article
Language:English
Published: Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01-02-2008
Blackwell Publishing Ltd
Blackwell
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
olfactometer
pheromone emission
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrates
semiochemicals
soybean weevil
South America
Brazil
America
soybean weevil
Coleoptera
Insecta
Soybean
pheromone émission
Time distribution
Pest
Arthropoda
Olfaction
Curculionidae
Aggregation pheromone
Invertebrata
Olfactometer
Semiochemicals
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Summary:The Brazilian soybean stalk weevil, Sternechus subsignatus Boehman (Coleoptera: Curculionidae), is a pest of economic importance in many regions of Brazil. Volatiles from both sexes of S. subsignatus were collected by aeration and the behavioural response of males and females was evaluated using a Y-olfactometer. The results obtained demonstrate that the communication in S. subsignatus is mediated by aggregation pheromone as both sexes were attracted to host plant (HP) volatiles, and this attraction was increased by the addition of male volatiles. At least five male-specific compounds (1-5) were detected in the chromatographic analysis, providing chemical support to the behavioural data. Release of these volatiles is dependent on the presence of the HP as the amount of compounds differs significantly when volatiles are collected from weevils with or without access to food. The release takes place mainly during photophase, showing a peak between 4 and 6 h after its beginning, which is also a peak of the insect activity in the field. Studies are underway to elucidate the structures of these putative aggregation pheromone components, in order to evaluate their biological activity under laboratory and field conditions.
Bibliography:http://dx.doi.org/10.1111/j.1439-0418.2007.01240.x
ArticleID:JEN1240
istex:0888385F0617E6C52455548B08D51D9366468F3B
ark:/67375/WNG-TP4V468H-F
ISSN:0931-2048
1439-0418
DOI:10.1111/j.1439-0418.2007.01240.x