Tree stopped growing after insect attack

[marlinspike]

I've been growing some sweet lemon trees from seed. Some of them are doing great, now a year and a half old and 3 feet tall, but one of them was attacked by insects early on, and ever since then it stopped. I have attached a picture. Anything I can do for it?

[tomc]

If it lives come May put it outdoors in the sun. Maybe more light will waken its urge to live.

[marlinspike]

If it lives come May put it outdoors in the sun. Maybe more light will waken its urge to live.

It will have to live for a while before I can do that - still snow on the ground here in VA.