Dawn is a bit of an ask, I have caught plenty of slugs an hour after dark. I take a jar of hot water and drop them in. it is the sort of damage I might expect from slugs or snails.. You can always check on your tree around dawn and notice if there are any.
Now that's a really good bit of advice, you don't want to go trying to kill things that are not there, that is a waste of time and money and damages the world.Try to spray only if the pest is identified.
I can't see a mite that needs a magnifying glass to see it being responsible for holes like that in the leaves. I might be wrong, but it looks like something bigger to eat out a hole right through the leaf, and the edges in the second picture look nibbled. I would put money on a slug or a caterpillar, and if you can't find them in the daytime slugs are the favourite for nocturnal damage.Now the time to stop more damage cause by insect simply by spraying horticultural oil sprays these are effective in treating pests of lemon trees known as citrus rust mites.
The citrus rust mite is a pest that feeds on citrus fruit, leaves, and stems. These are too small to see with the naked eye, but with a magnifying glass, they can be seen as pink or yellow in color and wedge shaped.
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