Fig. 5. Results from the second field-trapping experiment, 29 April to 7 May. Different amounts of potential semiochemicals were added to the pheromone blend of Eriocrania semipurpurella [50 µg of (R,Z)-6-nonen-2-ol and 50 µg of (S,Z)-6-nonen-2-ol]. The graph shows the number of males of the three species E. semipurpurella, E. sparrmannella and E. cicatricella caught per trap. Values are means + S.E.M. (N=15). One E. cicatricella male was caught in a trap containing 5 µg of (R)-heptan-2-ol (indicated with an asterisk). Columns labelled with the same letters are not significantly different (a,b,c refer to E. semipurpurella; a',b',c' refer to E. sparrmannella (Kruskal—Wallis analysis of variance followed by pairwise comparisons with a Mann—Whitney U-test; P<0.05).