Why is my poplar tree in the yard turning black?

What's causing this one tree to turn black?It started at the bottom and is now almost to the top limbs.I don't have a clue.

Answers:
A Yahoo search for "poplar trees" (include the quotation marks in the search box) yields 218,000 results. If you do the same search, and are willing to spend a little time exploring, I'm sure that you will quickly find the information you seek. There are several types of poplar trees and I would start by identifying the species in my yard. You will find information on common problems and diseases.

Good luck with your search.

Other answers:
The tree is about to die --tipical of poplars--they grow up fast --live about 10 to 15 yrs. and die off.
The tree is about to die --tipical of poplars--they grow up fast --live about 10 to 15 yrs. and die off.
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