of cutting off the tree's nutrient supply. "These beetles are the biggest mystery," says Worrall. Before SAD, aspen bark beetles were known to science, but "most entomologists who worked on aspen ...
Tree Physiology 27, 53-61 (2007). Foote, K. C. & Schaedle, M. The contribution of aspen Bark photosynthesis to the energy balance of the stem. Forest Science 24, 569-573 (1978). Grant, Michael C.
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