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spots on my dahlia leaves

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Posted by c-newby PA (My Page) on
Mon, Jun 23, 08 at 21:23

I have a cluster of black spots, or maybe holes, on some of my Dinnerplate dahlia leaves.
They look like someone took a pencil and tapped it on them about 30 times. There is one larger actual hole in the middle of the smaller ones. I can't find any photos online of anything like this.

Some of my lower leaves have also turned yellow, but other wise the plants seem happy.

Any ideas? And also, what should I do, if anything?

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RE: spots on my dahlia leaves

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  • Posted by jroot 5A Ont. Canada (near (My Page) on
    Tue, Jun 24, 08 at 9:05

If you have a digital camera, or access to one, that might be more helpful. It could be earwigs. It could be snails or slugs. We had a hail storm here, and I have a lot of leaf damage from the hail. There are too many variables to truly determine the cause of your dahlia's maladies.

Cut off the yellow lower leaves. I always trim the bottom few inches of leaves off. This helps with air circulation, and helps to prevent mildew from developing on them. The yellowing could be the result of too much water. Have you had a lot of rain lately?

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