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).
