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Strange black spots on cuke leaves

Posted by sewsewcreative Zone 9 (My Page) on
Mon, Jun 17, 13 at 13:39

Hello ~ and thank you so much for any advice or opinions in advance! I'm really excited to be posting here (this is the first time I've had a garden do this well!)!

My question involves strange black spots/schmutz on my cuke leaves (I'm also finding the same or similar spots on my neighboring grape leaves, too). An internet search led me to believe that the black spots were the result of gypsy moths/caterpillars, so I found BT spray at my local Lowes, which I then sprayed all over my plants.

Ideally, I'd like to make sure that I'm treating the problem correctly and haven't confused these black spots with other black spots. I've uploaded/attached two images that show the spots.

Any help is VERY appreciated! Thank you so much! <3


Follow-Up Postings:

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RE: Strange black spots on cuke leaves

Here's another image of the strange black spots. Again, any help is most appreciated! Thank you!


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RE: Strange black spots on cuke leaves

Where do you live in zone 9 that gypsy moths are a problem?

Anyway, it certainly looks like caterpillar frass. And the leaves are being devoured should be a sign of caterpillars. But what makes you think that the culprits are gypsy moths?


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RE: Strange black spots on cuke leaves

Hi Rhizo! Thank you so much for responding!

I got the idea just doing a general search on black spots on cuke leaves. I've not seen any caterpillars (lizards are a more frequent visitor to our garden area) nor moths ~ I just assumed.

I'm in Panama City Beach, if that makes a difference.

Again, thank you!


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RE: Strange black spots on cuke leaves

Whoops! Just realized that I'm zone 8b ... if that makes a difference. :/


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RE: Strange black spots on cuke leaves

Unless you manage to find the actual producer of all of that poop, we can't ID it for you. It won't be a gypsy moth, though. :-)

The Bt can be effective in controlling caterpillars while they are still young.


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RE: Strange black spots on cuke leaves

The only thing that Zone tells us is which plants will most likely survive a normal winter in your garden, beyond that it is meaningless since it tells us nothing of what kind of soil you may have, how much rainfall you may get, what kinds of insects you may have, etc.

The larva of the Gypsy Moth will eat the leaves, as well as leave large quantities of frass (a nice word for poop) so you will know they are present because your trees and shrubs will fairly quickly become bare. Same with the Tentworm Caterpillars. I find nothing that would indicate that either of these is a pest of the squash family of plants.


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RE: Strange black spots on cuke leaves

Gypsy moths don't occur in Florida.


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