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Showing posts from September, 2019

LEAF SPOTS ON HYDRANGEA

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On my recent garden visits, I’ve noted an abundance of leaf spots and unsightly foliage on hydrangeas. They can be bacterial leaf spot from an infection by Xanthomonas campestris, or Cercospora which grows from the pathogen Cercospora hydrangeae. I’m also seeing powdery mildew on many plants. You can thank Erysiphe friesii var. friesii (formerly Microsphaera friesii). If you’ve got blemished foliage, a trip to your local extension office can diagnose which it is so you can apply the proper treatment, if at all.

WEBWORMS ON PANICLE HYDRANGEAS

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In July, I wrote about webworms (Hyphantria cunea) on panicle hydrangeas.For the past several weeks, the second generation has been active in my neck of the woods. And boy, are they active! It seems every day they form new webs where none were the previous day. That will continue through October or until the first killing frost. Ugly doesn’t come close to what the plant looks like when these beasties are at work.