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Fig. 2. Activity-dependent emission of neral from one single Pieris napi
male, one P. napi male interacting with one male of P.
aegeria, two P. napi males, one P. napi male and one
virgin P. napi female, and one P. napi male interacting with
one mated P. napi female. It can be observed that the greater the
flight activity of the males (measured in s), the greater the emission of
citral.