There is a white substance on my stick verbena. At first it looked like a powder. Any thought as to what it could be?
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Walter Reeves on Jul 06, 2012Touch it with a twig to see if it jumps away.....could be planthopper insectsHelpful Reply
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Douglas Hunt on Jul 07, 2012Powdery mildew? Check out this link for a photo of powdery mildew on Verbena bonariensis and see if that's what you have: http://pnwhandbooks.org/plantdisease/host-disease-descriptions/verbena-powdery-mildewHelpful Reply
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