02098nas a2200205   4500008004100000020001400041245011300055210006900168260001100237300001400248490000700262520134100269653002701610100003001637700002301667700002201690700002601712700002301738856013101761       2007                        eng d  a0045-506700aDifferential impacts of the southern pine beetle, Dendroctonus frontalis, on Pinus palustris and Pinus taeda0 aDifferential impacts of the southern pine beetle Dendroctonus fr  cAugust  a1427-14370 v373 aPatterns of host use by herbivore pests can have serious consequences for natural and managed ecosystems but are often poorly understood. Here, we provide the first quantification of large differential impacts of the southern pine beetle, Dendroctonus frontalis Zimmermann, on loblolly pine, Pinus taeda L., and longleaf pine, Pinus palustris P. Mill., and evaluate putative mechanisms for the disparity. Spatially extensive survey data from recent epidemics indicate that, per square kilometre, stands of loblolly versus longleaf pine in four forests (380[long dash]1273 km2) sustained 3[long dash]18 times more local infestations and 3[long dash]116 times more tree mortality. Differences were not attributable to size or age structure of pine stands. Using pheromone-baited traps, we found no differences in the abundance of dispersing D. frontalis or its predator Thanasimus dubius Fabricius between loblolly and longleaf stands. Trapping triggered numerous attacks on trees, but the pine species did not differ in the probability of attack initiation or in the surface area of bark attacked by growing aggregations. We found no evidence for postaggregation mechanisms of discrimination or differential success on the two hosts, suggesting that early colonizers discriminate between host species before a pheromone plume is present.10aDendroctonus frontalis1 aFriedenberg, Nicholas, A.1 aWhited, Brenda, M.1 aSlone, Daniel, H.1 aMartinson, Sharon, J.1 aAyres, Matthew, P.  uhttps://weevil.myspecies.info/differential-impacts-southern-pine-beetle-dendroctonus-frontalis-pinus-palustris-and-pinus-taeda