Factors contributing to the susceptibility of grafted lodgepole pine seed orchard trees to the Warren root collar weevil were investigated at the Prince George Tree Improvement Station in north-central British Columbia. The scion and rootstock of 8 trees in each of 6 clones were sampled for relative monoterpene content, and diameters of rootstock and scion were measured. Attacked trees contained a significantly higher percent of ß-phellandrene than unattacked trees, but this was not consistent for all clones. Attacked trees of all clones contained less d-3-carene than unattacked trees, but this difference was not quite significant (p=0.051). Within clone, attacked trees had a significantly lower ratio of scion/root stock diameter. We conclude that a few monoterpenes may affect susceptibility, but that growth characteristics of the root stock relative to the scion is important, possibly indicating effects due to low-level graft incompatibility.
Species 1: Coleoptera Curculionidae Hylobius warreni (Warren root collar weevil)
Keywords: monoterpenes, graft incompatibility
The ESA 2001 Annual Meeting - 2001: An Entomological Odyssey of ESA