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White Powder at Crabapple Base: Possible Flatheaded Borer

Sawdust-Like Frass Indicates Borer Activity

White powder at soil line could be flatheaded apple borer frass. Spray lower trunk with Merit (imidacloprid) to kill larvae inside. Fertilize in mid-April with 10-10-10 (1 lb per inch trunk diameter). Avoid late-season fertilizing.

Pests: Maple Trunk Sunscald with Lichens: Borer Prevention and Wound Management; Mandarin Tree: Sooty Mold and Insect Complex in Australia; White Powder on Mulberry: Bark Lice or Powdery Mildew?; Scale Insects on Tulip Tree Trunk: Identification and Control; White Birch Decline After Spring Pruning: Sap Flow and Bacterial Wetwood; Northern Tooth Fungus on Maple: Hard White Ooze Confirmed; Woolly Apple Aphid Infestation on Mature Apple Tree; Storm Damage on Mature Conifer: Wound Care and Long-Term Assessment; Maple Borer Infestation in Old Wound: Treatment and Risk; White Oak Trunk Wounds: Borer Management and Vigor Improvement

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