North-South Variation in the Response of the Pine Engraver (Coleoptera: Scolytidae) to Lanierone and Ipsdienol in Eastern North America
Lindgren multiple-funnel traps were used to evaluate the response of the pine en- graver, Ips pini (Say), to the pheromones lanierone and ipsdienol, in Wisconsin and in southern Appalachia (western North Carolina and northern Georgia). As in Wisconsin, the attraction of I. pini to ipsdienol-baited traps in southern Appalachia was strongly synergised by lanierone. In Wisconsin, I. pini demonstrated a strong dose-response to both lanierone and ipsdienol, preferring traps releasing lanierone and ipsdienol at the highest rates. I. pini in northern Georgia exhibited dose response to ipsdienol, preferring traps with lures releasing ipsdienol at the highest rate, but little in the way of a dose response to lanierone across the range of release rates tested. In Georgia, the sympatric species I. avulsus preferred traps with lures releasing ipsdienol and lanierone at the highest rates.