Abstract
Seasonal adaptations of insects to climate conditions are always a combination of their responses to a great variety of environmental stimuli. Our investigations deal with some aspects of the long-term emergence period in phytophagous as well as entomophagous insects in Lithuania. During the investigation carried out in Lithuania from 1982 to 2004 the emergence season of adult Pleuroptya ruralis and its primary parasitoid Macrocentrus grandii was recorded between June and August. The beginning of adult emergence of P. ruralis has a negative correlation with spring temperature. The peak of P. ruralis adult emergence and values of the M. grandii adult emergence period have a negative correlation with June temperature. A tendency for an earlier peak emergence period has been recorded. It may be linked with a rise in annual, spring and summer temperatures in Lithuania.
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