Q. We have a pin oak tree that is approximately 30 feet tall. On the north-facing side of the tree there are many wilted leaves, and there are many balls of strange growth. Pictures of the leaves and ...

Oak trees have been around for more than 50 million years, with individual trees easily living 1,000 years. One of the oldest oak trees in the U.S. is believed to be at least 2,624 years old. The ...

Many coast live oak (Quercus agrifolia) trees are showing unusual browning in their canopies in the last month or two. If you look carefully, you may see small, crescent-shaped galls forming on the ...

The late spring frost could have started the problem which later spread with a disease of Oak Anthracnose (Gnomonia species), which causes the leaf curl. M. Grabowski, University of Minnesota Q: My ...

Although live oaks (Quercus virginiana) are considered evergreen because they hold onto their leaves through the winter, many live oaks drop most or all of their foliage at this time of year.

An average mature oak tree grows hundreds of thousands of leaves each year. When those leaves fall, their nutrients return to the soil to nourish the tree that grew them, as well as other living ...

Q. My blue oak tree and many others in the oak woodland are browning and shedding their leaves. What is the cause of this and how can I prevent it? A. The blue oak is a California native tree that ...

Oak leaf blister is caused by a fungus that attacks most species of oaks found in Louisiana. It can be particularly bad when the weather is cool and wet. (LSU AgCenter photo) Oak leaf blister, a ...