If you're interested in cloning citrus, you should know about the Citrus Clonal Protection Program (CCPP). The CCPP "provides a safe mechanism for the introduction into California of citrus varieties from any citrus-growing area of the world" and ...
Unsightly leaves at the tips of new citrus branches are often caused by citrus leafminers. They originate from a tiny moth that lays eggs only on new citrus tree growth. Its larva then tunnels around inside the leaf, eating between the top and bottom ...
Citrus Tree Problems
If you have problems with a citrus tree—including orange, lemon, lime—UC has resources that may help: Citrus Diseases and Disorders of Leaves and Twigs covers a range of problems including branch dieback, sooty mold, yellow leaves, and more. This ...
Citrus Sprouting Rootstock
Nursery-grown citrus plants generally consist of a desirable variety grafted onto a rootstock cultivar. "The rootstock cultivar makes up the lower few inches of the trunk and the tree’s roots. The scion cultivar makes up the rest of the trunk and ...
Why are my citrus leaves yellow (winter)?
Yellow citrus leaves are fairly common in late winter, often after winter fruit production and before spring new growth. You will want to apply fertilizer before the tree begins to bloom again. The UC Integrated Pest Management website has cultural ...