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Three leafroller species were monitored between 1976 and 2016 by bait and pheromone trapping for adults, larval damage to apples and timed searches on various hosts.
Populations of all three species decreased substantially; however, the endemic Planotortrix octo and Ctenopseustis obliquana declined to a much greater extent than did the introduced Epiphyas postvittana.
The two endemic species dominated...
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