Thick sticky white powdery web looking stuff covering bottom of leaves on my small oak tree .HELP

Question

Thick sticky white powdery web looking stuff covering bottom of leaves on my small oak tree .HELP

Answer 1

http://www.urimga.org/diseases.html

could this be it?

Answer 2

It does sound like a fungal infection. Try using a fungicide, perhaps one containing sulfur as the active ingredient. Use it in the evening, fungi grow activley at night and are more suceptible then.