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Distribution of Western Spruce Budworm Egg Masses on White Fir and Douglas-fir

机译:西部云杉蚜虫卵在白杉和花旗松上的分布

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摘要

Differences among trees and crown levels usually contributed significant variation to egg mass (EM) counts, while differences among aspects and between branches within the same crown level did not. The importance of each source of variation is discussed in relation to current EM-sampling techniques in the report.

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