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Birch Single Limb Dieback: Aphids and Ants

One limb on birch has leaf spots and appears dying; other birch fine. Many ants this year.

Ant-Aphid Farming

Ants "farm" aphids for honeydew. Signs: sticky sap "rain". Aphids may cause earlier leaf drop but don't kill tree. Single limb death not alarming if rest healthy. Control on large tree expensive; usually unnecessary.

Plant Diseases: Saving Mature Catalpa from Borers, Drought, and Age; Spongy Wood in Magnolia: Decay and Management; Italian Plum Tree Split Trunk and Dieback: Too Much Water from Lawn; Plum Tree Sudden Decline in Drought: Fire Blight or Borers?; Managing Aphid Honeydew on Garden Plants and Large Trees; Large Knot on Tree: Crown Gall or Callous Tissue?; Pine Tree Roots Cut for Pool: Is It Dying?; Woolly Aphids on Big Maple: Systemic Soil Drench Stops Honeydew; Japanese Black Pine Near Ocean: Fertilize, Stop Annual Injections; Large Maple with Trunk Cavity and Mushrooms: Decay Fungus, Not Emergency

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