Consideracoes sobre a producao de feromonio sexual por femeas de Stenoma decora Zeller (Lepidoptera: Stenomidae) e sua atratividade para os machos
The presence of a female sex pheromone in Stenoma decora is demonstrated by the attractiveness that virgin females, bred in the laboratory and placed in traps in the field, show to males. Observations were carried out during December 1980 and March 1981 at Itabuna, Bahia in a cocoa plantation that was heavily infested by the pest. Each Pherocon trap containing a virgin females was placed at a height of 1.5 - 2.0 m in a cacao tree. The majority of males were attracted to the traps between the times of 19:30 and 21:00. This period probably corresponds to the time of maximum pheromone liberation assuming that there is only a short interval between liberation and capture. In the laboratory the emergence of the adults also occurred at a characteristic time. For the majority this was between 16:30 and 19:00. Females emerging at this time begin to attract on the same day and their attractiveness diminished progressively with age. The female remained attractive for at least 4 days. These results suggest that the isolation chemical identification and synthesis of the pheromone may be worthwhile considering since synthectic pheromones may be used for population surveys and control of lepidopterous pests.
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| Format: | biblioteca |
| Published: |
1983
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| Subjects: | THEOBROMA CACAO, STENOMA DECORA, INSECTOS DAÑINOS DEL TALLO, LEPIDOPTERA, ATRAYENTES SEXUALES, FEROMONAS, BAHIA, BRASIL, |
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| Summary: | The presence of a female sex pheromone in Stenoma decora is demonstrated by the attractiveness that virgin females, bred in the laboratory and placed in traps in the field, show to males. Observations were carried out during December 1980 and March 1981 at Itabuna, Bahia in a cocoa plantation that was heavily infested by the pest. Each Pherocon trap containing a virgin females was placed at a height of 1.5 - 2.0 m in a cacao tree. The majority of males were attracted to the traps between the times of 19:30 and 21:00. This period probably corresponds to the time of maximum pheromone liberation assuming that there is only a short interval between liberation and capture. In the laboratory the emergence of the adults also occurred at a characteristic time. For the majority this was between 16:30 and 19:00. Females emerging at this time begin to attract on the same day and their attractiveness diminished progressively with age. The female remained attractive for at least 4 days. These results suggest that the isolation chemical identification and synthesis of the pheromone may be worthwhile considering since synthectic pheromones may be used for population surveys and control of lepidopterous pests. |
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