Beetles and larvae will become active in the spring as the weather begins to warm. Mature females will extend galleries and may or may not continue to oviposit. Some females will reemerge. Females that emerge will find bark crevices and excavate to the cambium. Egg galleries are vertical and straight and found within the phloem region, which may score or stain the cambium. The male will then join the female and mate, after mating the male may leave the gallery. Eggs are laid in egg niches, two eggs may be laid in one niche. There is a 7 to 10 day period before hatching followed by approximately a 300 day larval period. By June of the year after the eggs were laid most larvae have pupated, and most are mature by mid July. After the one month maturation period the newly mature adults will emerge weather conditions are appropriate. During outbreaks it will attack any acceptable hosts of any conifer species.
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