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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Diseases

Dutch Elm Disease vs. Herbicide Damage: Beetle Scars vs. Glyphosate Patterns

Distinguishing the Causes

  • Dutch Elm Disease: Spread by bark beetles. Look for beetle galleries (etching) under bark.
  • Herbicide (glyphosate): Must contact green leaves. Doesn't move through bark unless soaked. Lawn sprayers rarely hit tree canopies.

Arborist vs. Lawn Service

Arborist suspects herbicide; lawn service blames DED. James's 11-year landscape experience: employees often kill plants with Roundup drift.

Key Questions

  • Were trees young/low enough for spray drift?
  • Any beetle scars on bark?
  • Pattern of death (all at once = chemical; progressive = DED)?
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