can you tell me more?what size pot?what type soil.whats the area its setting in?is it on concrete?

Theree's a chance could be spider mites.you'd see trails on the leaves and the leaves may curl& might see ants(they heard about the bugs& came to eat)

This would be early sign of mites
http://edis.ifas.ufl.edu/EDISImagePage?imageID=612698892&dlNumber=HS122&tag=FIGURE%2022&credits=

also you mention lack of fertilizeing.The oldest leaves would show the 1st signs of nutrient defiencys.Longy is good for this topic.I believe he told me 1st yr fertlize 4 times& the 2nd yr 5 times. A fertilized plant thats healthy will fight off stuff better than a poorly fertilized one.they make citris spikes also,but i'm good about fertilizeing and my kumquat proably gets more than it needs being its doubled in size at 2 years,but grown inground versis your container.I have a Meiwa. they have a tastier fruit. they do like alot of water.especially on hot days& windy days

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