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Data from 1999 and 2000 field studies regarding the dispersal flight and initial attack behavior of the spruce beetle (Dendroctonus rufipennis Kirby) are summarized. More dispersing beetles were trapped in flight near the middle to upper tree bole than the lower bole. There were no significant differences between trap location and ambient temperatures. Initial attacks, however, were concentrated on the lower tree bole. Dispersal flight preceded initial attacks by 1 to 2 weeks. Field tests regarding the dispersal flight and initial attack of the spruce beetle (Dendroctonus rufipennis Kirby) were conducted on the Kenai Peninsula in stands of Lutz (Picea X lutzii (Little)) and Sitka spruce (P. sitchensis (Bong.) Carr.). Adult beetles disperse more commonly in the area surrounding the upper clear bole of the tree and the lower live crown, although initial attacks were concentrated on the lower tree bole. Females outnumbered males, and twice as many adults were trapped during flight in unthinned vs. thinned stands regardless of initial population levels. The majority of adult dispersal occurred when temperatures approached and exceeded 16 °C. The lower limit of dispersal flight was 12.8 °C. Abstract Summary 1 Introduction

Dispersal flight and attack of the spruce beetle, <em>Dendroctonus rufipennis</em>, in south-central Alaska.