i have a Naval orange tree on a swingle root-stock that are about 4 yrs old. This past Fall/Winter it bore oranges. Then this past spring it didn't produce blooms. I just fertilized it and took it as a rest period and moved on.. Then i sprayed it with horticulture oil to stop the citrus leaf miners.. A week later i noticed it started dropping a ton of leaves.. i thought it was due to spray burned.. it went from a bushy full tree to a almost bald eagle.. Then i noticed the leaves were starting to dis-color. I'm not sure if im getting citrus yellowing disease and citrus cankers.. So i need help diagnosing this tree