caa a22 4500 397571380 CHVBK 20180308164842.0 cr unu---uuuuu 161202e19961001xx s 000 0 eng 10.1093/ee/25.5.1012 doi (NATIONALLICENCE)oxford-10.1093/ee/25.5.1012 Alfaro René I. Pacific Forestry Centre, 506 W. Burnside Road, Victoria, BC, V8Z 1M5 Canada Feeding and Oviposition Preferences of White Pine Weevil (Coleoptera: Curculionidae) on Resistant and Susceptible Sitka Spruce Clones in Laboratory Bioassays [Elektronische Daten] [René I. Alfaro] White pine weevils, Pissodes strobi (Peck), caged on live clones (grafts) of resistant and susceptible Sitka spruce trees, Picea sitchensis (Bong) Carr., and petri dish experiments using cut branches from the same clones demonstrated that P. strobi feeding and oviposition was negatively correlated with the density of resin canals in the bark of the host tree. Weevils in cages containing resistant trees fed and oviposited preferentially in the internode below the leader, where resin canal density was lower (i. e., only the leader and not the entire tree was resistant). However, if given a choice, weevils departed from resistant trees and aggregated on susceptible trees. These experiments indicate that resistance is based on blockage by the tree of the normal preference of P. strobi for feeding and oviposition on the leader. This blockage is probably caused by repellency caused by the high resin concentration in the leader which, under natural conditions, forces the weevils to depart from resistant trees. The interaction of the weevil with other resistance mechanisms is discussed. © 1996 Entomological Society of America Population Ecology nationallicence Pissodes strobi nationallicence Picea spp nationallicence genetic resistance nationallicence resin canals nationallicence Environmental Entomology Oxford University Press 25/5(1996-10-01), 1012-1019 0046-225X 25:5<1012 1996 25 ee https://doi.org/10.1093/ee/25.5.1012 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.5.1012 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Alfaro René I. Pacific Forestry Centre, 506 W. Burnside Road, Victoria, BC, V8Z 1M5 Canada NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/5(1996-10-01), 1012-1019 0046-225X 25:5<1012 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford