Insect juvenile hormone analogs in conifers. III. Variability of Douglas-fir wood extractives with geographical location

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Abstract
Cores, branch wood, and foliage samples were taken from five healthy Douglas-fir trees at each of 20 sites across southern British Columbia, ranging from central Vancouver Island to the western slopes of the Rocky Mountains. Hybridization values for each tree were established by von Rudloff, based on the composition of the foliage essential oil. Branch wood samples and cores from bole wood were analyzed for lipophilic extractives content; the presence of juvabione-type insect juvenile hormone analogs (IJHA) was noted. A strong negative correlation was noted between lignin content and a hybrid index and a strong positive association between lignin content and diameter. There was a strong positive relationship between extractive content and age. Juvenile hormones were most commonly found in trees of the coastal and coastal intermediate subvariants. Branch wood and bole wood samples usually gave comparable results for the presence of the juvenile hormones.

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