Abstract
Excesses as well as deficiencies of rainfall may contribute to outbreaks. Damage to the root systems makes the trees more attractive to bark beetles than damage to the trunks and crowns. Bluestain does not always accompany the beetle. Brood of the beetle is not easily drowned, but development is arrested when infested bark is placed in ponds or streams. Since no adult emergence would follow such treatment, substantial reduction of populations could be accomplished.

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