Document Type

Scientific Note


Four species of bark- and wood-infesting borers (two Coleoptera and two Hymenoptera) and six parasitoid species (Hymenoptera) were reared from yellow birch (Betula alleghaniensis Britton) one year after the trees were cut and left standing in a woodlot in Ingham County, Michigan in 1986–87. The borers were species of Cerambycidae (Coleoptera) and Xiphydriidae (Hymenoptera), and hymenopteran parasitoid species of Aulacidae, Braconidae, Chalcididae, and Pteromalidae. Xiphydriophagus meyerinckii (Ratzeburg) (Pteromalidae) is a new Michigan state record. For the borers, yellow birch is a new host record for the cerambycid Sternidius alpha (Say) and the xiphydriid Xiphydria tibialis Say. Seasonal emergence data are presented for each insect, as well as sex ratio data for the xiphydriids and aulacid parasitoids. Mean (± SE) exit hole density for all borers and parasitoids combined was 2.3 ± 0.7 exit holes/dm2 for all branch and trunk samples, but significantly higher (4.7 ± 0.8 exit holes/dm2) on smaller branches (3-5 cm diam) vs. larger branches (0.3 ± 0.1 exit holes/dm2, 5-10 cm diam). Dry weight data for the most common borer (Xiphydria mellipes Harris) and most common parasitoid [Aulacus pallipes Cresson; Aulacidae] demonstrated wide intraspecific variation in adult size.

Included in

Entomology Commons



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