Just to add a bit, you may wish to wait a bit before cutting any questionable sections. In Danville, my lemons have re-sprouted leaves on branches that had a bit of brown. This week i will be cutting the moldy, light brown and very dead branches, but any questionable ones i will wait another month or two. On a different note, i just noticed my (previously 5 ft.) V.Pink Lemon in Napa push a nub 1/2" above the graft line. I think it felt me me wanting to dig it up and it responded. - ha! [now hoping my Bearss Lime will do the same] That December stretch of 10 18F-25F nights really surprised me as to what was killed and damaged... and which area of the yard too. I do plan to post pics of the recoveries. -George

looks like something is snaking on them, my little tree had the same thing and it turned out to be spider mites. im not familiar with the bugs in your area but i would check for that. sift your fingers through the soil and pay close attention because some of the criters are small and hard to notice. also if u havnt repoted it i would recomend doing that. be sure to remove all the old soil from the roots as it can harden there over time and choke out the tree. re pot it in a good draining soil that dosnt hold to much water. theres a recipe for a mix on here called 5.1.1 but you can use a cactus or sitrus soil from a garden center if you wish. if you do find that the problem is bugs you can spray with an insectasidial soap (follow the directions on the bottle) which u can also by at your garden center. you can also ask someone at the garden center for there advice im sure they will be happy to help. keep us posted and let us know how it turns out cheers, chris

As rhizo mentioned, those shiny paths are from citrus leaf miners. Little moths lay eggs on fresh growth, and when the eggs hatch, they burrow into the new leaves. The larvae leave zig-zag patterns behind. The damage is usually just cosmetic. Don't worry about removing the affected leaves since they're still producing energy for the plant. If they're a big problem, you can treat with spinosad, from what I read (I don't have them in Nebraska, for obvious reasons). There's plenty of information on this forum if you'd like more information. -Tom

Salt buildup. After flushing the soil the new leaves will be fine but the afected one will still die. Your tree is begging you to remove the pot with soil from the bigger fake one. Carbon dioxide is heavier than air and it will acumulate inside the big pot, suffocating the roots. Roots needs oxigen!