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Fig. 1. Five representative GC-MS chromatograms showing the emission from one
single Pieris napi male, one P. napi male interacting with
one male of Pararge aegeria, two P. napi males, and one
P. napi male and one virgin P. napi female, and one P.
napi male interacting with one mated P. napi female. Volatiles
were collected by SPME for 1 h. The two main compounds were neral and
geranial, with approximate proportions of 1:1. IS, the internal standard,
n-pentadecane.
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