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Lilac Damage from Hornets: Girdling Branches Causes Wilting

Insect Damage Mimics Disease in German Garden

An American in Germany has large old lilac with browning/wilting leaves and hornets eating bark off small branches.

Hornets Girdle Branches

Bark/cambium removal = girdling – Cuts nutrient flow to leaves
Control: Orthene, Dursban, or Sevin – When hornets present
Fall/spring fertilization – Regrowth stimulation

Wilting caused by hornet damage, not disease.

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