Millipedes climbing trees is unusual but harmless. They'll disappear as summer heats up. If intolerable, any garden insecticide will kill them, but it's unnecessary.

Bark Stripped Off Post Oak by Kids: Will the Tree Survive?
Magnolia Bark Splits: Normal Sloughing, No Treatment
Hackberry Bark Splitting, Powder & Ants: Heart Rot & Insects
Coral Bark Maple Losing Bark: Sunscald, Borers, or Natural Exfoliation?
Maple Bark Peeling: Decay Fungi and Borer Prevention
Borers in Dying Willow: Wire Probing and Systemic Insecticide
Brown Spots Inside Green Apples: Disease or Physiological Issue?
Fruitless Mulberry Decline: Bark Peeling, Borers, and End-of-Life Management
Rose Tree Bark Peeling: Root Issues, Disease, and Contagion Risk
Pecan Tree Bark Exfoliation: Normal Aging Process, Not Disease
Mimosa Tree Identification and Saving a Stressed Dogwood
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