Treating Borers in Young Black Locust Trees

Effective Insecticides

Trunk spray: Merit (imidacloprid) or Onyx (bifenthrin)—absorbed into wood, kills borers.
Soil systemic: Bayer Advanced Tree & Shrub Insect Control (imidacloprid)—roots distribute to whole tree.

Borers attack stressed trees. Fertilize with 10-10-10 at 1 lb per inch of trunk diameter, scattered to drip line, watered in.

Available at local nurseries; follow label rates.

Trees: Black Trunk Coating on Mulberry Trees: Sooty Mold; Why Maple Tree Bark Turns Black: Fungal Infestation Explained; Sapsucker Woodpecker Holes in Pecan: Insects Attracted to Sap; Fertilizing Century-Old Locust Trees for Vigor; Sooty Mold on Large Trees: Systemic Imidacloprid for Aphid Control; Finding Larger Purple Robe Locust: Buy B&B, Not Container; Diagnosing Two Problem Trees: Borer and Canker; Walnut Caterpillar Outbreak on Black Walnut: Identification and Control; Best Indoor Trees for a Warm Greenhouse in New York; Black Walnut Tree Diseases: Recognition and Management

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