Abstract
AbstractThe effect of wind speed and odour release rate on female Rhagoletis pomonella (Walsh) (Diptera: Tephritidae) responses to synthetic host apple volatiles was studied in a wind tunnel bioassay. Three apple tree models were placed in the wind tunnel (upwind, central and downwind sections) after which flies were released individually on the central tree and their movements observed for 15 min. The experiment was designed as a two‐way factorial with no odour and odour release rates of ca. 18 and ca. 500 μg h−1 and still air and wind speeds of 0.8 and 1.6 m s−1 as treatments. Both wind speed and odour had significant effects on flight frequency (landings min−1) and general fly activity. Fly movement decreased as wind speed increased from 0 m s−1 to 0.8 and 1.6 m s−1, but this decrease was attenuated when air carried apple volatiles. When air was odour‐free, flies exposed to 1.6 m s−1 wind moved downwind.
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