What's wrong with my Dahlias (with pictures)

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Posted by djc6535 none (My Page) on

Wed, Jul 13, 11 at 14:30

Hello, I've a few Dahlias I've planted in the Southern California area that seem to have some sort of leaf problem. Is this a disease, a parasite? A watering problem?

Here are some pics for reference. Any help is appreciated. Thanks!

https://lh4.googleusercontent.com/-scoLWLhdBHo/Th22lcFmCSI/AAAAAAAAEf8/RjSLXj7_j7o/s800/2011-07-13_06-39-18_724.jpg

and

https://lh6.googleusercontent.com/-QhVuW_rR6IQ/Th23MChwxYI/AAAAAAAAEgA/FOwgk3wEmL0/s800/2011-07-13_06-38-20_922.jpg

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RE: What's wrong with my Dahlias (with pictures)

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Posted by teddahlia (My Page) on
Sun, Jul 17, 11 at 13:26

Is it spider mites?

RE: What's wrong with my Dahlias (with pictures)

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Posted by allan4519 9 Northern NSW Au (allan@nonconform.com.au) on
Mon, Jul 18, 11 at 6:15

Hi djc6535 your dahlia looks like it has leaf minor, which is a burrow into the leaf leaving trails inside the leaf like your plants show.

Systemic insecticide will often kill them though not sure what is available in your area? Here in Australia Rogor insecticide is often used to get leaf miner & as Wikipedia explains there are many lava which cause this problem.

Good luck

Here is a link that might be useful: Leaf miner

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