02384nas a2200181   4500008004100000020001400041245018200055210006900237260000800306300001200314490000800326520163700334653002801971100002001999700002302019700002502042856013502067       2010                        eng d  a0008-347X00aDifferences in the constitutive terpene profile of lodgepole pine across a geographical range in British Columbia, and correlation with historical attack by mountain pine beetle0 aDifferences in the constitutive terpene profile of lodgepole pin  cNov  a557-5730 v1423 aThe mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae), is a destructive insect pest in western Nearctic conifer forests. Currently, British Columbia, Canada, is experiencing the largest recorded outbreak of this insect, including areas that historically have had low climatic suitability for it. We analyzed 26 constitutive resin terpenes in phloem samples from British Columbia lodgepole pine (Pinus contorta) populations to test for differential resistance to mountain pine beetle attack, based upon the likelihood of previous exposure to mountain pine beetle. We assessed sampled trees for number of mountain pine beetle attacks, number of pupal chambers, and tree survival the following spring. Significant differences were found when levels of certain terpenes in lodgepole pine populations that had likely experienced substantial mountain pine beetle infestations in the past were compared with those in populations that likely had not experienced large outbreaks of mountain pine beetle. Although we expected southern pine populations to contain more total terpenes than northern populations, owing to higher historical exposure to the beetle, the converse was found. Northern populations generally had higher levels of constitutive terpenes and beetle attack than southern populations. Because several terpenes are kairomones to the mountain pine beetle and also serve as precursors for the synthesis of pheromones, the lower levels of terpenes expressed by lodgepole pines from the historical range of the mountain pine beetle may render them less chemically perceptible to foraging beetles.10aDendroctonus ponderosae1 aClark, Erin, L.1 aCarroll, Allan, L.1 aHuber, Dezene, P. W.  uhttps://weevil.myspecies.info/differences-constitutive-terpene-profile-lodgepole-pine-across-geographical-range-british-columbia-a02122nas a2200181   4500008004100000020001400041245010900055210006900164260000800233300001200241490000800253520148300261653002501744100001401769700001301783700001501796856012901811       2010                        eng d  a0008-347X00aLaboratory evaluation of flight activity of Dendroctonus armandi (Coleoptera: Curculionidae: Scolytinae)0 aLaboratory evaluation of flight activity of Dendroctonus armandi  cJul  a378-3870 v1423 aDendroctonus armandi Tsai and Li is an important native pest of Chinese white pine (Pinus armandii Franch. (Pinaceae)) in the Qin ling Mountains of Shaanxi Province, People's Republic of China. Populations can reach epidemic levels and cause widespread mortality of trees in forest ecosystems. We studied the flight behaviour of D. armandi collected under controlled conditions using a flight-mill system to gather information to aid in its management. Our results indicate that D. armandi has three distinct flight patterns (intermittent flight, short-burst flight, and sustained uninterrupted flight). There were no significant differences in flight performance between males and females. Median daily values for total distance traveled, total flight time, and maximum uninterrupted flight time were 275.1 m day-1, 815 s day-1, 40 s day-1, (n = 148). Individuals displayed positive phototactic behaviour: total flight distance and total flight time were greater under artificial illumination than in natural light or darkness. The level of flight activity increased throughout the morning, remained high during the afternoon (1400-1600), dropped considerably at 1800, and was lowest at midnight. There was no significant difference in flight distance or flight time between the first and second generations. From the data collected, it is clear that the phototactic response is an important factor in the flight behaviour of D. armandi and may influence its spatial dispersal.10aDendroctonus armandi1 aChen, Hui1 aLi, Zhen1 aTang, Ming  uhttps://weevil.myspecies.info/laboratory-evaluation-flight-activity-dendroctonus-armandi-coleoptera-curculionidae-scolytinae