The eastern larch beetle, Dendroctonus simplex LeConte and the pine engraver, Ips pini (Say) (Coleoptera: Scolytidae) are native bark beetles that occur in Michigan and are generally considered to be secondary forest pests. Significant outbreaks of eastern larch beetle have recently occurred in tamarack (Larix laricina) forests in Michigan’s Upper Peninsula. The pine engraver causes localized damage to pines (Pinus spp.). The shutdown of the response to known attractive chemical baits by three antiattractants (3-methylcyclohex-2-en-1-one (MCH), 4-allylanisole (=methyl chavicol) and verbenone) was tested for each species of bark beetle. The effect of the antiattractants on each sex of each species of beetle was determined. The results have implications for management aimed at reducing damage by these insects in the future.