citrus tree
#1

i have a grapefruit tree that produced 3 nice size fruits and alot of undersized fruit .recently the leaves turned yellow and most have fallen off. Ijust bought the house just north of tampa bay fl.could this have happened from over watering? i have a n orange tree that is fine.
#2

It does sound cultural but the problem needs identification. Contact your local Cooperative Extension Service office. You can find them by entering http://www.reeusda.gov/1700/statepartners/usa.htm. Click on your state, then your county, then find your local office. A Master Gardener, experienced and trained in your area, will be able to assist you with problem identification, cultural information, etc.
Best - Ladybug
Best - Ladybug