Journal of Economic Entomology (1997) 90, 235-239

Elizabeth S. Tomlin and John H. Borden (1997)
Thin bark and high density of outer resin ducts: interrelated resistance traits in Sitka spruce against the white pine weevil (Coleoptera: Curculionidae)
Journal of Economic Entomology 90 (1), 235-239
Abstract: Park thickness and density of outer resin ducts were examined in specific clones of Sitka spruce, Picea sitchensis (Bong) Carr., to determine their relationship with resistance status of those clones to the white pine weevil, Pissodes strobi (Peck). High density of outer resin ducts was associated positively with resistance. The most resistant clones had a combination of thin bark and high density of outer resin canals, suggesting that interaction between these 2 traits is a strong resistance mechanism. Susceptible trees had both thin bark and low densities of outer resin canals. One highly resistant clone had thin bark and few resin canals, suggesting the existence of other resistance mechanisms.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): John H. Borden

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pissodes strobi	Spruce (Picea)