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Oddity in diel periodicity of Ditula angustiorana (Haw.) (Lepidoptera: Torticidae) female calling behaviour, pheromone titre and reproductive activity

2011; Taylor & Francis; Volume: 47; Issue: 1-2 Linguagem: Inglês

10.1080/00379271.2011.10697713

2168-6351

Arnaud Ameline, Brigitte Frérot,

Insect and Arachnid Ecology and Behavior

The diel periodicity of female calling behaviour in Ditula angustiorana (Haw.) was studied under laboratory conditions. Observations throughout photophases and scotophases showed that D. angustiorana females presented a rare diurnal calling behaviour with two distinct calling periods, one at the fi rst part of the photophase (L+5) and another one at the end (L+14). Mating only occurred during the second calling period (L+14). Five components were identifi ed in extracts of the pheromone glands: Z10-14:Ac, 14:Ac, Z10-14:OH, Z8-14:Ac, Z8-14:OH in the average ratio of 74.1/18.2/4.8/2.2/0.6 respectively. The blend ratio remains similar throughout the photoperiod, whilst the total quantity of pheromone components reached a maximum during the calling period overlapping the mating period (L+14). Wind tunnel experiment confi rms that the synthetic blend baited with the identifi ed pheromone components was as attractive as calling females for males. The particular chemical structure of the components within Tortricidae and the particular occurrence of the two calling periods, one not matching any reproductive behaviour are discussed in terms of phylogeny and sexual selection.