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Within white spruce stands near Fairbanks, Alaska, and on the Kenai Peninsula, Alaska, Dendroctonus rufipennis, Ips spp., and Trypodendron lineatum disperse in late May and early June; other scolytids fly during June and July. Flight in interior Alaska precedes by about 2 weeks that on the Kenai Peninsula. Mean daily temperatures during spring and early summer are generally warmer in the interior than in coastal areas. There was a large increase in the total number of beetles in a thinned area, mostly of Dryocoetes affaber.

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Can. Ent. 106: 1241-1246 (1974) A procedure is described for evaluating commercial residual pesticides commonly used for house fly control. Blotting paper panels were treated with candidate products and aged up to 5 weeks. During aging, these panels were tested thrice at 1 , 3, and 5 weeks after their treatment for efficacy based on mortality of female house flies exposed to them for 24 h in a cage. A product is reported satisfactory if the -average percentage kill obtained is not less than 80, 60, and 50 at 1, 3, and 5 weeks aging respectively or within 5 percentage points less than these limits. A product meeting first and third week mortality limits is also considered acceptable.