186,341 research outputs found
Proceedings of the meeting at Lund (Sweden) 9-14 September, 2007: Pheromones and other semiochemicals in integrated production
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Improved weighted least-squares minimax design of FIR filters specified in frequency and time domain
No full textEvaluation of the damage caused by chestnut Tortricidae in the Trentino district and analysis of the pheromone bouquet for monitoring
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Une nouvelle tordeuse en Turquie, Cydia turcianae n.sp. (Lepidoptera, Tortricidae)
No full textA new Tortricid species (Cydia turcianae n. sp.) from Turkey, captured in sticky traps baited with synthetic sex attractant, is described by wing patterns and male genitalia.Cette note concerne la description de l'habitus et des genitalia d'une nouvelle espèce de Tordeuse (Cydia turcianae n. sp.) de Turquie, capturée au moyen de pièges englués appâtés avec des attractifs sexuels de synthèse.Chambon Jean-Pierre, Witzgall P., Bengtsson M. Une nouvelle tordeuse en Turquie, Cydia turcianae n.sp. (Lepidoptera, Tortricidae). In: Bulletin de la Société entomologique de France, volume 98 (2), juin 1993. pp. 181-183
Dannosità delle tre cidie del castagno nell'ambiente trentino e valutazioni delle miscele feromonali di monitoraggio
No full textValutazione di trappole e feromoni sessuali per il monitoraggio delle tre cidie del castagno Pammene fasciana L., Cydia fagiglandana Zel. e Cydia splendana HB.
No full textDisruption of Phthorimaea operculella (Lepidoptera: Gelechiidae) oviposition by the application of host plant volatiles
No full textBackground: Phthorimaea operculella is a key pest of potato. We characterized the P. operculella olfactory system, selected the most bioactive host plant volatiles and evaluated their potential application in pest management. The electrophysiological responses of olfactory receptor neurons (ORNs) housed in long sensilla trichodea of P. operculella to plant volatiles and the two main sex-pheromone components were evaluated by the single cell recording technique (SCR). The four most SCR-active volatiles were tested in a laboratory oviposition bioassay and under storage warehouse conditions.
Results: The sensitivity of sensilla trichodea to short-chained aldehydes and alcohols and the existence of ORNs tuned to pheromones in females were characterized. Male recordings revealed at least 2 types of ORNs, each of which typically responded to one of the two pheromone components. Hexanal, octanal, nonanal and 1-octen-3-ol significantly disrupted the egg-laying behaviour in a dose-dependent manner. Octanal reduced the P. operculella infestation rate when used under storage conditions.
Conclusions: This work provides new information on the perception of plant volatiles and sex-pheromones by P. operculella. Laboratory and warehouse experiments point out that the use of hexanal, octanal, nonanal and 1-octen-3-ol, as host recognition disruptants and/or oviposition deterrents for P. operculella control appears to be a promising strategy
Coding and interaction of sex pheromone and plant volatile signals in the antennal lobe of the codling moth Cydia pomonella
No full textIn the codling moth Cydia pomonella (Lepidoptera: Tortricidae) plant volatiles attract males and females by upwind flight and synergise the male response to the female-produced sex pheromone, indicating a close relationship between the perception of social and environmental olfactory signals. We have studied the anatomical and functional organisation of the antennal lobe (AL), the primary olfactory centre, of C. pomonella with respect to the integration of sex pheromone and host-plant volatile information. A three-dimensional reconstruction of the glomerular structure of the AL revealed 50±2 and 49±2 glomeruli in males and females, respectively. These glomeruli are functional units involved in the coding of odour quality. The glomerular map of the AL was then integrated with electrophysiological recordings of the response of individual neurons in the AL of males and females to sex pheromone components and behaviourally active plant volatiles. By means of intracellular recordings and stainings, we physiologically characterised ca. 50 neurons in each sex, revealing complex patterns of activation and a wide variation in response dynamics to these test compounds. Stimulation with single chemicals and their two-component blends produced both synergistic and inhibitory interactions in projection neurons innervating ordinary glomeruli and the macroglomerular complex. Our results show that the sex pheromone and plant odours are processed in an across-fibre coding pattern. The lack of a clear segregation between the pheromone and general odour subsystems in the AL of the codling moth suggests a level of interaction that has not been reported from other insects
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