Find out about common North American trees with pinnate leaves. Learn how to identify hickory, ash, walnut, black locust, and pecan using this guide.

As a result, the trees are dropping leaves. I looked at a few backyard pecan trees while visiting a homeowner recently Most of the leaves dropping had black spots on the leaves.

Leaves of pecan trees typically intercept 65% to 70% of available sunlight with up to 95% light interception in overcrowded, unpruned orchards; less light naturally affects photosynthesis.

Pecan Trees in Austin, Tx Prematurely Losing Their Leaves. By MARILYN KIRCUS , Lady Bird Johnson Wildflower Center, UT Sep 3, 2010 Question: Why are the leaves on the pecan trees falling so early ...

Leaves of pecan trees typically intercept 65% to 70% of available sunlight with up to 95% light interception in overcrowded, unpruned orchards; less light naturally affects photosynthesis.

Their branches form a more narrow canopy than what you might see in a pecan or oak tree. A cedar elm's leaves are about 1-2.5 inches long, and the leaves can turn gold to orange-red in the fall.