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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Forsythia > Spots or blotches on leaves

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Forsythia > Stems/branches > Spots or blotches on leaves

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Four-lined plant bug
Poecilocapsus lineatus

  • Small, round depressed spots which may be brown, black or translucent on leaves
  • Dead plant tissue may fall out causing a "shot hole" effect
  • Newly hatched nymphs are red with black wing pads and become yellowish green with a black stripe on each wing pad as they develop
  • Adults are one half inch long, yellowish to yellow green in color with four longitudinal black stripes on the wing covers
  • More information on four-lined plant bugs
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Bacterial blight
Pseudomonas syringae pv syringae

  • Brown spots with yellowish haloes on leaves
  • Spots may enlarge or grow together causing the leaves to turn black and die
  • Young shoots and stems may be black and wilted
  • Flowers and flower buds turn black and wilt
  • More information on Pseudomonas blight

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