What is happening to the huge oak trees in Missouri, they are dying.

Or just loosing there leaves for the Fall.........

Being in Texas....we have a lot of different species of Oak trees. Live Oak trees stay green through the winter and then drop all their leaves in the Spring. We also have a species that is in crisis to a disease called "Oak Wilt". Look that up on Google images and see if it resembles what you are seeing. It's a very invasive disease and cutting down trees and burning them does not eliminate the spores......it almost spreads them. Good luck....I hope it's something treatable for you.

Just looked at a google map for "Oak Wilt" and it stretches from Texas to Illinois right over Missouri. If you have it in your area or yard, call a tree surgeon for advice. It really has to be treated, but areas where there is raw land, the trees just succumb to it. It's very sad.

Drought killed them in California.

Looks like there's a beetle infestion- http://mobugs.blogspot.co.il/2009/03/loss-of-oak-trees-in-missouri-linked-to.html

OMG ! So sorry to hear that... May be the Local Parks & Gardens Department might be able to help