i have an avocado tree that i grafted about 4 years ago.

last year the tree looked beautiful. it had about 30 avocados

and finally wound up with only 7. three of the original are

still on the tree. this year its doing very poorly. its dropping all the leaves and the fruit remains very small. [about the size of an appleseed.] i noticed today that some of the leaves

have brown veins.can anyone diagnose this for me? the tree is on a mound and is watered every 4 to 5 days.thanks much

art