Question
The majority of our trees are blackjacks,we have three dead in our back yard,and this happened real fast, how can we save our trees, and what is causing this. thank you, we live in florida.

Answer
There is just not enough information to provide a reason for the trees dying. It could be anything from droughts, too much water, herbicide use on the lawns, fungi or insects. I would suggest that you call the Florida Division of Forestry (state agency) and ask one of their Foresters to come out and take a look. They should be able after looking at the tree determine the problem. Here is a link to their contact web page. http://www.fl-dof.com/field_operations/county_foresters/index.html