Citrus leaves are bending and getting eaten away. Is this a disease or some deficiency? How do I control/prevent this?

poison spray on plant

spray insecticide to save tree from insects.

In your plant, drive the ants that protect aphids, a mostly sucking pest in citrus.The ants also fight to save the other sucking pests from predators. So, using sticky glue on the pathway along the stems is a best biological control measure of these enemy ants. Thank you for your interests in Plantix Community!

Thank you sir. Citrus Leaf Miner does look like the culprit.

Thank you sir.

yes, you're right, most of the young leaves are affected by citrus leaf miner and subsequently leaves suffer to deform that can't prepare sufficient food for development and physiological needs.

Citrus Leaf Miner attack

Look at the Citrus Leaf Miner adult, please study more details in Plantix Library by clicking on blue hyperlink link at Citrus Leaf Miner

I will try some of these methods and will update accordingly. Thanks for the in depth answer, sir.

You're welcome 😍