Spectral composition of light source in the experimental room
a) Over the whole insect-visible spectrum; b) expanded view of the near-UV region(with an increased integration time) showing the availability of < 400nm light in addition to human-visible light. Spectra were measured with an Avantes AvaSpec-2048 with an integration time of a) 15ms and b) 50ms respectively, in the centre of bench areas where work took place.
Analysis of insects' directions of movement
a) Results of Rayleigh test analysis (z-scores) of S. zeamais orientation vectors and b) binomial test probabilities (Bonferroni-corrected to a significance value of 0.0016) in the presence and absence of host odours. Visual stimuli were presented at 90° to the camera azimuth and odour stimuli at 180° to the camera azimuth. (In a), * indicates p < 0.05, ** p < 0.01, *** p < 0.001; in b) # indicates significance after correction.)