I planted my lemon tree about 6 months ago and it generally took well to its new location. Unfortunately, since the colder days and nights picked up appears to be struggling. Key noticeable issues (in the images) are
1. Curling leaves (mostly on new growth)
2. Leaves eating away
I've done some research which has brought up likely issues of under or over watering, and some kind of bugs.
Any help would be great!
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I suspect that pests have caused the curling of the leaves and not over or under-watering. Are there silvery tracks over them, or is there evidence of insects under or in the curled leaves? If there are silvery lines, then that would indicate the pest citrus leaf miner is present. It curls the leaves similar to what you have shown.
I'd suggest spraying the tree thoroughly every two weeks with Yates 750ml Ready To Use Pest Oil. You'll want to coat the top and bottom of all leaves with the Pest oil. This will rid the plant of a variety of pests, including the leaf miner.