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Bayer's Merit insecticide effectively controls bronze birch borer with preventative and curative control of this opportunistic insect. Left untreated, these borers can sever the vital pipeline between the canopy and the roots of your tree, leading to decreased root growth and function. To keep your birch trees in excellent health, use sound management practices and several applications of Bayer's Merit insecticide to keep these destructive wood borers at bay.