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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Species >> Trees

Dogwood Trunk Ooze: Borer, Not Slime Flux

Milky‑White Sap = Borer Pressure Relief

No odor rules out slime flux. A borer (likely flatheaded or clearwing) has entered near a pruned branch; tree pumps sap to drown it.

Treatment

Spray trunk/branches with imidacloprid (Merit) or bifenthrin (Onyx)—penetrates bark, kills larvae. Flow stops once borer dies.

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