morning glories

Question

The leaves on my plants get brown spots and I cannot find any insects on them. I end up with just the veins of the leaves. To be safe, I have sprayed with a insecticide, but still have the issue.

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Answer 1

This looks like Leafcutter damage which is a green caterpillar that feasts at night. You have a few options but since you haven't spotted the critter I would go straight for the Pyrethrin or neem oil. Both are organically derived pesticides and wont harm your plants or beneficial insects.