Lemon Tree dropping leaves suddenly

sara says...
This can be caused by any number of reasons, but the most common is a great fluctuation in temperature causing the leaves falling off the lemon tree to continue to drop until the tree can handle the temperature once more.make sure the temperature doesn’t fluctuate and is more of a constant temperature. This will definitely help stop the leaves falling off the lemon tree.Citrus leaf problems can also be caused by scale. Scale insects will cause lemon tree leaves to fall off the trees as well. These insects can be removed from the leaves of the citrus tree with a sharp knife. You can also use your fingernail. If you find that there are too many insects to remove this way, you can spray the tree down. Either spray the tree leaves with alcohol, or if you want to go a more natural way, use a mixture of lemon juice, garlic juice and cayenne pepper. (I havent tried this but have been told it works) If, after checking the tree out thoroughly, you find the leaves are still falling off your lemon tree, you should make sure the soil around the roots is wet enough. These trees like a lot of water and you need to be sure you water them thoroughly each time you water them.
Hope this helps.