Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2.
J Econ Entomol. 2011 Jun;104(3):889-94. doi: 10.1603/ec10336.
A bark disk bioassay was used to assess the effectiveness of different insecticides for control of overwintering adult native elm bark beetles, Hylurgopinus rufipes (Eichoff) (Coleoptera: Curculionidae). Insecticides were applied to the base of the trunks of living American elm trees, Ulmus americana L., and bark disk samples were removed at intervals with a hole saw. Adult H. rufipes were exposed in bioassay chambers for which the bark disks formed the floor of the chamber. In September 2005, chlorpyrifos, permethrin, and a water control were applied to trees in five replicated blocks, and bark disk samples were taken at intervals over the following 725 d. In September 2006, chlorpyrifos, permethrin, carbaryl, bifenthrin, and a water control were applied to trees in six replicated blocks, and disk samples were removed at intervals up to 1,163 d after application. In both experiments, beetle mortality was 100% on chlorpyrifos-treated disks removed up to 725 d after treatment and, in the 2006 trial, declined thereafter. The pattern of mortality in the bifenthrin treatment did not differ significantly from that in the chlorpyrifos treatment in the 2006 experiment. Average corrected mortality on disks treated with permethrin or carbaryl declined below 100% by 11 d after application. On disks removed in the May following treatment, 248 d after application, average corrected mortality was 42-44% on permethrin-treated disks and 26% on carbaryl-treated disks.
采用树皮圆盘生物测定法评估不同杀虫剂防治越冬美国榆树皮甲虫（Hylurgopinus rufipes (Eichoff)）（鞘翅目：象甲科）的效果。将杀虫剂施用于活体美国榆树干的基部，并使用孔锯每隔一定时间取下树皮圆盘样本。将 H. rufipes 成虫暴露在生物测定室中，树皮圆盘作为室底。2005 年 9 月，将毒死蜱、氯菊酯和水对照剂施用于五个重复块中的树木，随后在接下来的 725 天内每隔一定时间取树皮圆盘样本。2006 年 9 月，将毒死蜱、氯菊酯、甲萘威、联苯菊酯和水对照剂施用于六个重复块中的树木，并在施药后长达 1163 天内每隔一定时间取出圆盘样本。在这两个实验中，处理后 725 天内取出的含毒死蜱的圆盘上的甲虫死亡率为 100%，此后死亡率下降。在 2006 年的试验中，联苯菊酯处理的死亡率模式与毒死蜱处理的死亡率模式没有显著差异。处理后 11 天，用氯菊酯或甲萘威处理的圆盘的平均校正死亡率下降到 100%以下。在处理后 248 天，即 5 月取圆盘时，经氯菊酯处理的圆盘的平均校正死亡率为 42-44%，而经甲萘威处理的圆盘的死亡率为 26%。
