Lemon and Orange curled leaves
Fort Bend County Texas
You are dealing with citrus leafminer. This little moth larvae eats inside the leaf and causes it to curl up. Not a real big deal. Normally, we do not recommend treating, mainly because the damage you see cannot be corrected and that it is hard to treat the pest at the right time. Below is a good reference to help you understand this a little better.
Thanks for information. Can I feed Apson salt to help fruit on lemon and vegetables
Well.... yes you can. Will it harm anything? No. But...
Do you need to? No. Epsom salts are a way to deliver Magnesium to the plant. If you purchase a complete fertilizer with micronutrients, that product should have everything the plant needs. Look for a product like Medina Hasta-Grow Plus, or similar.
Further, most soil samples from our region show that we are good for nearly all of the plant necessary nutrients, except for nitrogen. So, if you do anything, provide the plants with a nitrogen fertilizer.
If you have additional questions, please email to my direct email address listed below. I can respond much quicker that way.