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Laboratory experiments on sexual isolation between the 2 species ostrinia furnacalis and ostrinia scapulalis pacifica lepidoptera pyralidae



Laboratory experiments on sexual isolation between the 2 species ostrinia furnacalis and ostrinia scapulalis pacifica lepidoptera pyralidae



Research Bulletin of Obihiro University Series I 9(4): 769-778



The coefficient of isolation calculated from the male multiple choice method indicated there was a strong sexual isolation between Ostrinia furnacalis and O. scapulalis pacifica. In the mate choice tests, males mated with the females of their own species with an intense preference. Under conditions of artificial and natural lighting, there was significant difference in the mean mating time of 2 day old adults between the 2 spp. The mating time of O. scapulalis pacifica was delayed due to the coexistence of O. furnacalis males. In mating behavior and duration of copulation, no marked difference could be found between either of the species.

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