Do your citrus leaves look like that? That tree is being killed by Citrus Greening disease, Huanglongbing (HLB).
HLB has hit Los Angeles County! Don’t spread this tree-killing disease. Don’t take or send your citrus fruit, trees, leaves, or any part of your trees out of the area. Consume your oranges, lemons, grapefruits, and other citrus where you live. If you are used to sharing your citrus with family and friends, invite them over to enjoy it instead of sending it to them or having them take some home.