Here is a few things you can try if it is just one or two spots:
(these tips on the bunny proofing thing of this site)
https://binkybunny.com/BUNNYINFO/tabid/53/CategoryID/8/PID/940/Default.aspx
Use Scented Deterrents
My vet told me about this trick. Spray a little perfume on the area. I have found that spraying it can be too strong for even the humans, so I spray perfume into a paper towel and wipe the towel on the area. This works well. Many of the areas my bunnies have permanently rejected but some areas I still have to refresh every few weeks.
Member Tip- “Rub a little pure lemon oil on the spot lasts longer than perfume, and I think it is just as effective. If you don’t have that, just rub a lemon rind on it.” By ScarletRose
Commercial Bitter Sprays for Pets This works for two of my rabbits, but Jack actually likes the Bitter Apple Spray, so it has the opposite effect.
Put a bend a bridge on the spot (A toy you can get at pets mart or something)
http://www.petco.com/product/116368/Planet-Petco-Bend-A-Bridge-Small-Animal-Chew-Toy.aspx
You can also lay a phone book there or towels you do not mind them tossing around over the spot.
You can also put a cardboard box there (make sure the bottom is over the spot and put hay or shredded paper to play dig with.
My rabbit has a spot in the kitchen she wants to chew at. First we put this rug down under some of those cube things. (We had a cube wall already there to stop her from getting at something else) She still dug the rug out to chew at it. (The real floor carpet) So I put the rug back with a cube thing on the bottom so she can’t dig it up anymore.
Here is a picture to show what I did (Not sure if it is really explained well above):
