| Measurement of Odor-Plume Structure in a Wind Tunnel Using a Photoionization Detector and a Tracer Gas |
2002 |
41 pages |
| Authors:
Kristine A. Justus; John Murlis; Chris Jones; Ring T. Carde; CALIFORNIA UNIV RIVERSIDE DEPT OF ENTOMOLOGY
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 | The patterns of stimulus available to moths flying along pheromone plumes in a 3-m-long wind tunnel were characterized using a high frequency photoionization detector in conjunction with an inert tracer gas. Four contrasting flow regimes and source conditions were produced: odor released in pulses from a vertical and horizontal array of four sources, odor released continuously from a point source, and odor released continuously from a point source into an ... |
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| Flight Behaviour of Males of Two Moths, Cadra Cautella and Pectinophora Gossypiella, in Homogeneous Clouds of Pheromone |
2002 |
21 pages |
| Authors:
Kristine A. Justus; Ring T. Carde; CALIFORNIA UNIV RIVERSIDE DEPT OF ENTOMOLOGY
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| Abstract. It is thought that orientation by male moths along pheromone plumes is guided by interception of filaments of pheromone along that plume and that clean air gaps are required for upwind progress. Given that several investigations have determined that cells sensitive to pheromone can resolve only low rates of encounter with pheromone filaments, generally less up to 10 pulses %%1, it would appear that individual filaments encountered at higher ... |
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| Flight Behaviour of Cadra Cautella Males in Rapidly Pulsed Pheromone Plumes |
2002 |
22 pages |
| Authors:
Kristine A. Justus; Steven W. Schofield; John Murlis; Ring T. Carde; CALIFORNIA UNIV RIVERSIDE DEPT OF ENTOMOLOGY
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| Airborne pheromone plumes in wind comprise filaments or odour interspersed with gaps of clean air. When flying moths intercept a filament, they have a tendency to surge upwind momentarily, and then fly crosswind until another filament is intercepted. Thus, the moment-to- moment contact with pheromone mediates the shape of a flight track along the plume. Within some range of favourable interception rates, flight tracks become straighter and are headed more ... |
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| Antennal Resolution of Pulsed Pheromone Plumes in Three Moth Species |
2002 |
23 pages |
| Authors:
Josep Bau; Kristine A. Justus; Ring T. Carde; CALIFORNIA UNIV RIVERSIDE DEPT OF ENTOMOLOGY
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| Male antennae of Cadra cautella, Pectinophora gossypiella, and Spodoptera exigua were presented with 20-ms-duration pulses of their two- component pheromone at rates of 1 to 33 Hz. Fourier analyses of electroantennograms resolved the temporal structure of trains of pheromone filaments delivered at up to 33 Hz for C. cautella and S. exigua and 25 Hz for P. gossypiella. Pheromone components tested separately for each species were generally equivalent in filament ... |
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