Olfactory response of the weevil Mecinus pascuorum to host plant odour in the presence of different non-host plant odours in the surroundings.

Setup: two-circle olfactometer. Duration of stay in the central field and time to reach the central field (latency) [in seconds] are shown for 20 females tested per treatment observed for 300s. Only dummies (DU) or herbaceous species (HE; Achillea millefolium and Agrimonia eupatoria) and grass species (GR; Festuca rubra and Poa pratensis) were presented in different combinations in the ambient, or additional to the host plant, (HO; Plantago lanceolata) in the central chamber. Dummies consisted of a pot filled with soil and a green sheet of paper. Medians and interquartile ranges (parentheses) are given. n.s. indicates no significant difference (P>0.05) when comparing the different treatments for one behavioural parameter evaluated by Kruskal-Wallis ANOVA followed by Mann-Whitney-U test and Bonferroni correction.