Powdery or Downy Mildew on Cantaloupe

lasparks63June 29, 2009

Can you guys tell me which one this is and the best way to treat it? I've also got a pic of a leaf with some green squiggly lines. I've been trying to figure out what it is as well. Thanks so much for your help.


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The second pic is leaf miner damage. Not too much to be concerned about with that. Sorry, I can't help with the first pic, but it does look like some kind of fungal disease.

Here is a link that might be useful: The Haphazard Gardener

    Bookmark   June 29, 2009 at 8:05PM
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Hi Lisa,

It more than likely is downy mildew, as it is common on cantaloupe and watermelons (along with other melons). As Stephanie said, the second picture is a leaf miner, but not a biggie, unless it becomes an infestation.

Neem Oil will help with mildews, but it is also a pesticide so be gentle if using. The website below has more info on powdery mildew and leaf miners, if you need it.

Here is a link that might be useful: Downy Mildew

    Bookmark   June 29, 2009 at 9:06PM
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jean001(z8aPortland, OR)

Downy mildew makes angular lesions. Your plant looks more like powdery mildew.

    Bookmark   June 29, 2009 at 10:46PM
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Thanks for the help. I've sprayed everything down with the following recipe:
1 t baking soda
3 drops castile soap
6 drops neem
1 qt water
Sprayed tops and bottoms of leaves and will continue every week crossing my fingers this will clear up the problem. I'm going to remove the worst leaves, but don't want to pull off to many at a time so I can give the leaf production a chance to catch up. I've got quite a few big melons I don't want to lose. Boy, am I learning a lot after my first year gardening!

    Bookmark   June 30, 2009 at 3:11PM
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Karen Pease

Why are you combining both baking soda and neem? I don't see a need for neem in the symptoms that you presented.

    Bookmark   June 30, 2009 at 4:13PM
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That's the recipe I found. I'm actually using the fertilome triple action that's a fungicide and insecticide so I can get rid of any bad critters at the same time.

I'm wondering how many leaves I can safely remove at one time so I don't overly stress the plants. I've got about 8 good size cantaloupes close to being ripe and I really don't want to lose them at this stage of the game. Any advice?

    Bookmark   July 4, 2009 at 3:24PM
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