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From:
Minnesota Department of Natural Resources
(Uncensored)
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Eastern spruce budworm | Minnesota DNR
https://www.dnr.state.mn.us/treecare/forest_health/spruce-budworm/index.html
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Eastern spruce budworm is a native insect and is the most destructive pest of spruce-fir forests in eastern North America. Caterpillars prefer to feed on balsam fir and white spruce, but minimal feeding damage can occur other various pines.
