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PY

Pamela Yataco

Student Speaker | Étudiant.e
The main defoliators of white spruce (Picea glauca) in mixed wood forest (Cook et al., 1978, MacLean and Ebert, 1999) and plantations (Hall et al., 1994) are outbreaking insects which cause great losses in the production of lumber. To identify the most damaging herbivorous species, and other possible inconspicuous defoliators, we focused on herbivore diversity in two treatments, mixed wood forest and plantation. Ten sites of both treatments were selected, from which six to ten trees were sampled. The insects were identified at the species level or classified as a morphospecies. Damage by herbivorous insects were also classified, depending on what group of arthropods formed it. We used Shannon diversity index to analyze the difference between treatments, using linear models and ANOVAs. Species did not differ between the treatments, however, defoliation by sawfly was highly present in forest while galls were more abundant in plantations.