UBC Undergraduate Research

Impact of simulated mechanical defoliation caused by Zeiraphera canadensis (spruce bud moth) on food resource availability on Picea glauca (white spruce) in subsequent years Then, May Anne


Zeiraphera canadensis (spruce bud moth) larvae feed on newly burst buds of Picea glauca (white spruce). It has been observed that Z. canadensis herbivory on apical shoots leads to loss of apical dominance and the release of dormant buds in subsequent years due to shoot damage. It has also been observed that there is greater success of larval colonization in years following herbivory. This paper explores whether Z. canadensis herbivory increases the amount of food resource available for subsequent generations by simulating mechanical defoliation in a controlled experiment. The results rejected our original hypothesis and total buds produced was found to decrease with increasing herbivory. We did not observe positive resource regulation feedback in the spruce bud moth and white spruce system.

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