The life cycle of the Two-line chestnut borer is very similar to that of the bronze birch borer. The eggs of are laid in the branch crotches and bark crevices. The larvae then bore through the bark into the phloem and xylem and create small galleries in the tree where they feed until winter. The larvae then spend the winter dormant in the gallery. In spring they begin a pupation period and turn into adults. The adults then emerge from June to July and begin laying eggs to start the reproduction process all over again. Similarly to other pests, the damage to the tree does not come from the adults but rather from the larvae. The galleries created by the larvae feeding disrupt water and nutrient movement in the infested tree. Management on the tree usually does not work because the stressing symptoms often last two years after the initial occurrence which allows for the borer to come back and continue attacking the host.
• Considered a moderate pest
• Attacks weakened or stressed trees
• White Oak
• Swamp White Oak
• Bur Oak
• Northern Pin Oak
• Red Oak
• Black Oak
• Wait until stressing factors have subsided
• Removal and replacement is best option
• Manament of tree usually does not work
• Two-lined chestnut borer. 2016. Minnesota Department of Natural Resources. Online. Accessed 2-11-2016.
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