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Verbena rigida

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Question from Iris Lando

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I have several of these. Starting at the base, some have had very dark brown blotches all over the leaves for at least a month. In other respects they look no different from the rest. They continue to flower but the markings are dominant and unsightly. I did not have this problem last year when they were newly planted. I am about to prune them down and destroy all the cuttings. Should I spray with something first?
Thanks
Iris

  • Views: 1038
  • Replies: 1
  • Posted: Sun. 20th September 2009 21:57

Verbena spots

Reply from Kathy C

Hi, Iris,
From your description, it doesn't sound like powdery mildew or botrytis blight - the two fungi that typically attack Verbena rigida. More likely, the dark brown blotches are caused by water resting on the leaves for too long after rain or irrigating. They could also be caused by overcrowded or excessively moist conditions. If you prune them down now, destroy all cut material - by burning if you are in a place you can do so. Cover the cut plant with a dry winter mulch. Don't bother spraying. If it is a fungus, it is best to spray in spring as a preventative measure to stop the fungus from coming back.
Is there any chance you could post a photo so I can be sure to rule out mildew or botrytis?
Kathy C.

  • Posted: Tue. 22nd September 2009 20:49