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- W2083418424 abstract ". Responses of Rhagoletis pomonella (Wash) (Diptera: Tephritidae) to synthetic host fruit violates were studied in the field. Individually marked females were released in the centre of a 25 m2 patch containing twenty-five host trees (Crataegus mollis var, toba) and followed as they moved within and between trees. Fly response to three experimental conditions was studied: (1) ‘clean’ air; (2) synthetic host fruit violates (apple) permeating the patch; and (3) a single point source of odour placed c 1m away from the edge of the patch. Files in a patch permeated with host odour moved faster, exhibited more straightened-out moves, and reached the edges of the patch more quickly than those exposed to clean air. Flies exposed to a point source of odour exhibited clear orientation responses, arriving consistently at the tree harbouring the source of odour. Odour exposure was intermittent and usually brief (c. 20s-1 exposure) with intervals between exposure periods averaging 103s. Wind speed and direction were highly variable. Flies moved during wind ranging in speed form 0.5 to 4.4 m s-1, with their activity being greatest at winds below 2m s-1. Strong winds (>3.5 ms-1) either arrested movement or enhanced downwind displacement. Our observations tend to support the ‘series-of-steps’ hypothesis reviewed by Gibson & Brandy (1985) as a mechanism of close-range host location (1-5m from odour source). Our findings are discussed with respect to theoretical and practical implications of insect orientation mechanisms to odours, dispersal, and control strategies." @default.
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- W2083418424 date "1992-03-01" @default.
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- W2083418424 title "Host Search behaviour by Rhagoletis pomonella files: inter-tree movement patterns in response to wind-borne fruit volatiles under filed conditions" @default.
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- W2083418424 doi "https://doi.org/10.1111/j.1365-3032.1992.tb00983.x" @default.
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