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14![Management Outbreaks often last two to four years. Weather conditions, parasites and predators are contributing factors to population decline. A reduction in pollen cone production following sustained Management Outbreaks often last two to four years. Weather conditions, parasites and predators are contributing factors to population decline. A reduction in pollen cone production following sustained](https://www.pdfsearch.io/img/10cc927293ba1335258decb177a753fa.jpg) | Add to Reading ListSource URL: www.gov.mb.caLanguage: English - Date: 2013-01-07 12:58:02
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17![Large Aspen Tortrix Yukon Forest Health — Forest insect and disease Energy, Mines and Resources Large Aspen Tortrix Yukon Forest Health — Forest insect and disease Energy, Mines and Resources](https://www.pdfsearch.io/img/dd14914dfaf95770996bf265ce9046ba.jpg) | Add to Reading ListSource URL: www.emr.gov.yk.caLanguage: English - Date: 2014-08-31 15:06:35
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