
BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on June 17, 2020
This appears bacterial. I would treat with a bactericide. Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/info/applying-bactericide-to-plants.htm
https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-growing-tips.htm
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