heres my situation.... i have a cast member who plays a "pleasant looking middle aged man", right now he looks like a scruffy college hippie dropout.  At auditons i cast him into the part with the understanding that he would cut his hair. Now with 2 weeks till opening night still no hair cut with nothing but excuses why it hasnt been done, what should i do? At this point im ready to boot him from the show and just play the part myself.... Am I asking to much?, would it be wrong to uncast him because of his appearance? Help Please!

I agree whole-heartedly.  Ask him if he's going to keep up his end of the bargain.  If not, an you have a suitable replacement (you), can him.  For my productions I always try to have a cosmetologist on hand for hair so if we do need to have someone's hair cut or colored there is someone right there to do it or at least to set up an appointment immediately.  We're lucky because we have about some great cosmetologists that can do "show hair" and will sign on to a show for an ad in the program.  I also budget in my production budget for such haircuts or colors.  Does the actor possibly have money issues slowing him down?  If so, do you have the money in the budget to pay for his hair cut?  That would eliminate that excuse. 

There may be underlying issues causing him to be reluctant to get his hair cut.  If the only true excuse is "I don't wanna" - then kick him to the curb.