Table 2.

Attraction of Whittleia retiella males to bait series 1 at four different field observations in 2017 (Obs 1–3) and 2018 (Obs 4)

Compound	Bait composition
Isoprop-C5DA			10	30		30	10	30	100		10	30
(rac)-2b-C5DA					200	200	100	100
(S)-2b-C5DA										100	100	100
(R)-2b-C5DA		100	100	100
Blank	BL
Obs 1 N = 4								●		●		●
Obs 2 N = 1								●		●		●
Obs 3 N = 6								●		●		●
Obs 4 N = 2								●				●

Isoprop-C5DA = 1-methylethyl (5Z)-dec-5-enoate, 2b-C5DA = 1-methylpropyl (5Z)-dec-5-enoate. Different enaniomeric composition of 2b-C5DA (S, R or racemic) is indicated. Numbers represent μg loading of different synthetic compounds on the baits. Blank baits were loaded with n-hexane (hx) only. Black dots represent baits visited by one or more males at each observation, respectively. N = number of approaching males at each observation. At all occasions, the baits were displayed in parallel with bait series 2 (see Table 3)