Canadian Forest Service Publications
Influence of mortality factors and host resistance on the population dynamics of emerald ash borer (Coleoptera: Buprestidae) in urban forests.2015. MacQuarrie, C.J.K. and Scharbach, R. Environmental Entomology 44: 160-173.
Issued by: Great Lakes Forestry Centre
Catalog ID: 35929
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Plain Language Summary
This paper identified the factors that kill emerald ash borer larvae in urban trees, and determined how those factors influence how populations grow. We wanted to determine which factors affect larvae in different locations in the tree (i.e., in the crown, and in the trunk), and if this affect varied in any way. We found that diseases and unidentifiable factors killed the most larvae; and that small populations tended to suffer very high mortality, but only in the crown of the tree. EAB is known to attack the crown of the tree first, which suggests that tree resistance may limit how fast new infestations of EAB grow. However, once EAB overcome this resistance populations are able grow, and grow very fast. This may explain why new infestations appear to ‘explode’ shortly after they are found. Our results also suggest that surveying the crown of a tree may be the best way to locate small infestations; and that management tactics that benefit the health of trees may limit the growth of EAB populations.