Dendroctonus pseudotsugae: A Hypothesis Regarding Its Primary Attractant.
The Douglas-fir beetle is attracted to alpha-pinene but repelled by beta-pinene. Attacks on standing trees are related to the content of alpha- or beta-pinene in the tree; this correlation suggests that volatile oils may be the stimuli initially attracting the insect to the Douglas fir.
Heikkenen
H J
HJ
Hrutfiord
B F
BF