Beech....Whats up ya old fart!!!!
Thought id chime in here
Tinny, if you have no pics., can you go into detail more than "they turned yellow?", Are they curling under on the sides or tips? Are the brown and crispy on any parts?
How did you tie it down? Hooks? or string? If its string check you didn't choke the branches by tying too tight.....Ive seen it done before
Or that you didnt bend the branches down too far and crack the stems. Too much stress thru pressure of bending the stalks will also choke it out. It cant move nutrients or water thru the capillaries to feed plant or deliver chlorophyll to the plant from the leaves. Read up on LST techniques to learn how to tie down with out damaging the plant.