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Old 12-04-2012, 10:46 PM
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RigglePLC RigglePLC is online now
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Join Date: Jul 2006
Location: Grand Rapids MI
Posts: 10,974
The most important early sign (aside from dozens of dead trees along your streets) is the presence of D-shaped exit holes in the bark. They are shaped like a capital D with the flat side down. Slightly less than 1/4th inch wide. The larvae of the borer make these holes when the leave the tree.
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