Abstract
ABSTRACT. The responses of third instar carrot fly larvae, Psila rosae, to plant metabolites were studied in a moving air olfactometer. Directed responses over distances greater than 7.5 cm were obtained to both host and non‐host plant odours, to CO2 and methyl eugenol, a volatile secondary metabolite of carrot roots. Larvae also oriented to gradients of contact‐chemostimuli. The role of both olfactory and contact‐chemostimuli in the host plant finding behaviour of P. rosae larvae is discussed, and observational evidence for the behavioural mechanisms involved presented.
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