02166nas a2200181   4500008004100000020001400041245007700055210006900132260001100201300001200212490000700224520156900231653002801800100002301828700001901851700002201870856009201892       2012                        eng d  a1461-955500aThe role of vision in the host orientation behaviour of Hylobius warreni0 arole of vision in the host orientation behaviour of Hylobius war  cAugust  a286-2940 v143 a1 Visual stimuli, often in combination with olfactory stimuli, are frequently important components of host selection by forest-dwelling phytophagous insects. 2 Warren root collar weevil Hylobius warreni Wood (Coleoptera: Curculionidae) is a native insect in western Canada, where larvae feed primarily on lodgepole pine Pinus contorta and can girdle and kill young trees. This weevil is an emerging problem in areas heavily impacted by mountain pine beetle Dendroctonus ponderosae Hopkins. 3 No olfactory attractants have been identified for this insect, making monitoring and management difficult. Thus, we investigated the role of vision in the host-finding behaviour of Warren root collar weevil in the absence of known olfactory cues. 4 We conducted three experiments in field enclosure plots aiming to characterize aspects of host-finding behaviour by adult Warren root collar weevil. 5 We found that both male and female weevils were readily attracted to vertical plastic silhouettes in the shape of a trunk, crown or tree at distances of less than 4 m. This pattern of attraction persisted over 2 years in two slightly different study designs. Blinding the insects removed their ability to orient to these silhouettes, indicating that host-finding behaviour has a strong visual component. The use of different colour trunks and crowns (black, white and green) did not change the patterns of attraction of the insects to the silhouettes. 6 Exploiting visual attraction in this walking insect may present a new management tool in forest protection strategies.10aDendroctonus ponderosae1 aMachial, Laura, A.1 aLindgren, B.S.1 aAukema, Brian, H.  uhttps://weevil.myspecies.info/role-vision-host-orientation-behaviour-hylobius-warreni-002164nas a2200181   4500008004100000020001400041245007700055210006900132260001100201300001200212490000700224520156900231653002801800100002301828700001901851700002201870856009001892       2012                        eng d  a1461-955500aThe role of vision in the host orientation behaviour of Hylobius warreni0 arole of vision in the host orientation behaviour of Hylobius war  cAugust  a286-2940 v143 a1 Visual stimuli, often in combination with olfactory stimuli, are frequently important components of host selection by forest-dwelling phytophagous insects. 2 Warren root collar weevil Hylobius warreni Wood (Coleoptera: Curculionidae) is a native insect in western Canada, where larvae feed primarily on lodgepole pine Pinus contorta and can girdle and kill young trees. This weevil is an emerging problem in areas heavily impacted by mountain pine beetle Dendroctonus ponderosae Hopkins. 3 No olfactory attractants have been identified for this insect, making monitoring and management difficult. Thus, we investigated the role of vision in the host-finding behaviour of Warren root collar weevil in the absence of known olfactory cues. 4 We conducted three experiments in field enclosure plots aiming to characterize aspects of host-finding behaviour by adult Warren root collar weevil. 5 We found that both male and female weevils were readily attracted to vertical plastic silhouettes in the shape of a trunk, crown or tree at distances of less than 4 m. This pattern of attraction persisted over 2 years in two slightly different study designs. Blinding the insects removed their ability to orient to these silhouettes, indicating that host-finding behaviour has a strong visual component. The use of different colour trunks and crowns (black, white and green) did not change the patterns of attraction of the insects to the silhouettes. 6 Exploiting visual attraction in this walking insect may present a new management tool in forest protection strategies.10aDendroctonus ponderosae1 aMachial, Laura, A.1 aLindgren, B.S.1 aAukema, Brian, H.  uhttps://weevil.myspecies.info/role-vision-host-orientation-behaviour-hylobius-warreni02010nas a2200193   4500008004100000020001400041245017800055210006900233260001300302300001000315490000700325520122900332653002801561100002501589700002201614700002701636700001901663856013401682       2009                        eng d  a1461-955500aSuccessful colonization, reproduction, and new generation emergence in live interior hybrid spruce Picea engelmannii x glauca by mountain pine beetle Dendroctonus ponderosae0 aSuccessful colonization reproduction and new generation emergenc  cFebruary  a83-890 v113 a1 Although mountain pine beetle Dendroctonus ponderosae Hopkins are able to utilize most available Pinus spp. as hosts, successful colonization and reproduction in other hosts within the Pinaceae is rare.2 We observed successful reproduction of mountain pine beetle and emergence of new generation adults from interior hybrid spruce Picea engelmannii x glauca and compared a number of parameters related to colonization and reproductive success in spruce with nearby lodgepole pine Pinus contorta infested by mountain pine beetle.3 The results obtained indicate that reduced competition in spruce allowed mountain pine beetle parents that survived the colonization process to produce more offspring per pair than in more heavily-infested nearby pine.4 We also conducted an experiment in which 20 spruce and 20 lodgepole pines were baited with the aggregation pheromone of mountain pine beetle. Nineteen pines (95%) and eight spruce (40%) were attacked by mountain pine beetle, with eight (40%) and three (15%) mass-attacked, respectively.5 Successful attacks on nonhost trees during extreme epidemics may be one mechanism by which host shifts and subsequent speciation events have occurred in Dendroctonus spp. bark beetles.10aDendroctonus ponderosae1 aHuber, Dezene, P. W.1 aAukema, Brian, H.1 aHodgkinson, Robert, S.1 aLindgren, B.S.  uhttps://weevil.myspecies.info/successful-colonization-reproduction-and-new-generation-emergence-live-interior-hybrid-spruce-picea02937nas a2200193   4500008004500000020001400045245010800059210006900167260001300236300001200249490000700261520225200268653002802520653001302548100002102561700001902582700002302601856011902624       2008                        Engldsh    a1461-955500aThe enemy of my enemy is still my enemy: competitors add to predator load of a tree-killing bark beetle0 aenemy of my enemy is still my enemy competitors add to predator   cNovember  a411-4210 v103 a1 The mountain pine beetle Dendroctonus ponderosae is a major tree-killing bark beetle in North America. We evaluated how the subsequent arrival of a competing bark beetle Ips pini influences the arrival of predators and their impact on both species.2 The predators Temnochila chlorodia and Enoclerus sphegeus were strongly attracted to pheromones of D. ponderosae. By contrast, Enoclerus lecontei was mostly attracted to I. pini pheromones. The host compound myrcene synergized attraction of both D. ponderosae and E. sphegeus to the pheromone of D. ponderosae. However, it inhibited attraction of both I. pini and E. lecontei to I. pini's pheromone.3 Dendroctonus ponderosae were more attracted to trees than logs treated with its pheromones, whereas I. pini were more attracted to logs than trees treated with its pheromones. Some 78% of T. chlorodia were captured at hosts baited with D. ponderosae pheromones, whereas 83% of E. lecontei were captured at hosts baited with I. pini pheromones. We characterized the sequence of arrival to live trees baited with pheromones of D. ponderosae as: D. ponderosae, T. chlorodia, E. sphegeus, I. pini, E. lecontei.4 Various combinations of I. pini and predators were added to logs colonized by D. ponderosae in the above sequence of arrival observed in live trees baited with D. ponderosae aggregation pheromones. Ips pini reduced D. ponderosae adult brood production. However, the combination of I. pini and E. lecontei did not raise D. ponderosae brood production above that observed with only I. pini present. Similarly, the combination of I. pini and T. chlorodia did not reduce D. ponderosae brood production below that observed with I. pini alone. By contrast, the combination of I. pini, T. chlorodia and E. lecontei caused more brood loss to D. ponderosae than I. pini alone.5 Enoclerus lecontei did not reduce brood production by T. chlorodia, whereas T. chlorodia substantially reduced brood production by E. lecontei.6 Secondary bark beetles that exploit the resource created by primary tree-killing species exert negative effects through both competition and increased predator load. Implications to the population dynamics, ecology and evolution of tree-killing bark beetles are discussed.10aDendroctonus ponderosae10aIps pini1 aBoone, Celia, K.1 aSix, Diana, L.1 aRaffa, Kenneth, F.  uhttps://weevil.myspecies.info/enemy-my-enemy-still-my-enemy-competitors-add-predator-load-tree-killing-bark-beetle