Ips sexdentatus (Boerner) Screening Aid
(Subfamily Scolytinae, Tribe Ipini)
From: Cavey, J., Passoa, S. and Kucera D. 1994, Screening Aids for Exotic Bark Beetles in the Northeastern United States. NA-TP-11-94. Northeastern Area: U.S. Department of Agriculture, Forest Service.
General Appearance in a Survey Sample. At 5.5-8.2 mm in length, I. sexdentatus would be one of the largest scolytids found in a survey sample from the northeastern U.S. This brown species has an excavated elytral declivity armed laterally with spines. Viewed from above, erect yellow hairs protrude from the body perimeter.
Recognizing the Genus. In general, Ips differs from other North American scolytids in having the following combination of characters (from Wood 1982, 1986):
Members of the most similar genera, Orthotomicus and Acanthotomicus, are much smaller in size than I. sexdentatus.
Recognizing I. sexdentatus. This species is named for the six spines or teeth found on each lateral margin of the elytral declivity (Fig. 3). Of the U.S. Ips that have more than four spines on the declivity, only grandicollis (with 5 spines, the 3rd spine largest) and calligraphus (with 6 spines) occur in the NER (Wood 1982, Lanier 1987, Lanier et al. 1991). Both species could be present in numbers in survey samples.
The following will separate the target exotic species from I. calligraphus:
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