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Home → Publications → Tree Improvement and Genetics → Northeastern Forest Tree Improvement Conference → 26th Northeastern Forest Tree Improvement Conference (1978) → Cortical Strobic Acid Concentrations in Eastern White Pine Resistant and Susceptible to the White-Pine Weevil

Cortical Strobic Acid Concentrations in Eastern White Pine Resistant and Susceptible to the White-Pine Weevil

Resin acid concentrations in cortical oleoresin from 48 weevil-resistant eastern white pines and 40 susceptible trees were analyzed quantitatively by gas-liquid chromatography. The analyses revealed no significant differences between weevil-resistant and susceptible groups for any of the nine resin acids detected. Strobic acid concentration averaged 22.3 percent of total resin acids in resistant trees; 22.7 percent in susceptible trees. Mean strobic acid concentration was slightly lower in the 20 shortest susceptible trees than it was in the 24 tallest resistant trees. Of the 88 trees sampled, only 2 did not have strobic acid; and both of these trees were highly susceptible to weevil attack. Except for the two trees that had no strobic acid, resistant and susceptible trees were approximately equally distributed within the entire range of strobic acid concentration. This study suggests that eastern white pine with no or low concentrations of strobic acid are rare; and that even if such trees could be easily located, they may be no more resistant to the white-pine weevil than trees with high concentrations.


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Author(s): Ronald C. Wilkinson

Publication: Tree Improvement and Genetics - Northeastern Forest Tree Improvement Conference - 1978