Canadian Forest Service Publications
Landscape level impacts of EIS on SBW, other herbivores and associates natural enemies (ACOA RD100 2.2.2). 2018. Martel, V.; Johns, R.; Eveleigh, E.; McCann, K.; Pureswaran, D.; Sylvain, Z.; Morrison, A.; Morin, B.; Owens, E.; Hébert, C. In SERG International 2018 Workshop Proceedings. pp. 138-146.
Issued by: Laurentian Forestry Centre
Catalog ID: 39036
Availability: PDF (download)
We report on results from the final year of our research project aimed at addressing three key questions underlying the Early Intervention Strategy: (1) Does treatment cause enough additive mortality (i.e., mortality in addition to what would otherwise occur naturally) to cause populations to decline? (2) Does mass moth migration offset the efficacy of treatments? (3) Do treatments cause unintended effects on non-target caterpillars and natural enemies. In 2017, preliminary results suggest that treatments caused (tilde)20% additive mortality across the range of densities studied. Moreover, intergenerational population growth rates (based on L2 larval collections in 2016 and 2017), indicated that treatments cause mild to significant budworm declines, whereas in untreated sites budworm densities generally increased. Our results also indicated that treating sites relatively early ((tilde)L4.5) yielded higher efficacy than treating late ((tilde)L6). Validation of molecular approaches to identify parasitoids in frozen larvae remains underway.